2102100 - Disclosure - Background and Basis of Presentation link:presentationLink link:calculationLink link:definitionLink 2402401 - Disclosure - Background and Basis of Presentation (Details) link:presentationLink link:calculationLink link:definitionLink 1003001 - Statement - Balance Sheets Parentheticals link:presentationLink link:calculationLink link:definitionLink 2111100 - Disclosure - Capital Stock link:presentationLink link:calculationLink link:definitionLink 2411401 - Disclosure - Capital Stock (Details) link:presentationLink link:calculationLink link:definitionLink 2115100 - Disclosure - Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 2415401 - Disclosure - Commitments and Contingencies (Details) link:presentationLink link:calculationLink link:definitionLink 1002001 - Statement - Comprehensive Income Parentheticals link:presentationLink link:calculationLink link:definitionLink 1003000 - Statement - Condensed Consolidated Balance Sheets (Unaudited) link:presentationLink link:calculationLink link:definitionLink 1004000 - Statement - Condensed Statements of Consolidated Cash Flow Statement link:presentationLink link:calculationLink link:definitionLink 1002000 - Statement - Condensed Statements of Consolidated Comprehensive Income (Unaudited) link:presentationLink link:calculationLink link:definitionLink 1001000 - Statement - Condensed Statements of Consolidated Income (Unaudited) link:presentationLink link:calculationLink link:definitionLink 2406403 - Disclosure - Derivative Fair Values (Details) link:presentationLink link:calculationLink link:definitionLink 2106100 - Disclosure - Derivative Instruments link:presentationLink link:calculationLink link:definitionLink 2406402 - Disclosure - Derivative Instruments Derivatives and hedging (Details) link:presentationLink link:calculationLink link:definitionLink 2306301 - Disclosure - Derivative Instruments (Tables) link:presentationLink link:calculationLink link:definitionLink 0001000 - Document - Document and Entity Supplemental Information Document link:presentationLink link:calculationLink link:definitionLink 2116100 - Disclosure - Earnings Per Share link:presentationLink link:calculationLink link:definitionLink 2416402 - Disclosure - Earnings Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 2316301 - Disclosure - Earnings Per Share (Tables) link:presentationLink link:calculationLink link:definitionLink 2104100 - Disclosure - Employee Benefit Plans link:presentationLink link:calculationLink link:definitionLink 2404402 - Disclosure - Employee Benefit Plans (Details) link:presentationLink link:calculationLink link:definitionLink 2404402 - Disclosure - Employee Benefit Plans (Details) link:presentationLink link:calculationLink link:definitionLink 2304301 - Disclosure - Employee Benefit Plans (Tables) link:presentationLink link:calculationLink link:definitionLink 2107100 - Disclosure - Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 2407402 - Disclosure - Fair Value Measurements (Details) link:presentationLink link:calculationLink link:definitionLink 2307301 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 2110100 - Disclosure - Goodwill link:presentationLink link:calculationLink link:definitionLink 2410402 - Disclosure - Goodwill (Details) link:presentationLink link:calculationLink link:definitionLink 2310301 - Disclosure - Goodwill (Tables) link:presentationLink link:calculationLink link:definitionLink 2114100 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 2414402 - Disclosure - Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 2314301 - Disclosure - Income Taxes (Tables) link:presentationLink link:calculationLink link:definitionLink 2412402 - Disclosure - Indexed Debt Securities (ZENS) and Securities Related to ZENS (Details) link:presentationLink link:calculationLink link:definitionLink 2112100 - Disclosure - Indexed Debt Securities (ZENS) and Securities Related to ZENS (Notes) link:presentationLink link:calculationLink link:definitionLink 2312301 - Disclosure - Indexed Debt Securities (ZENS) and Securities Related to ZENS (Tables) link:presentationLink link:calculationLink link:definitionLink 2103100 - Disclosure - New Accounting Pronouncements link:presentationLink link:calculationLink link:definitionLink 2403401 - Disclosure - New Accounting Pronouncements New Accounting Pronouncements and Changes in Accounting Principles (Details) link:presentationLink link:calculationLink link:definitionLink 2105100 - Disclosure - Regulatory Accounting link:presentationLink link:calculationLink link:definitionLink 2405401 - Disclosure - Regulatory Accounting (Details) link:presentationLink link:calculationLink link:definitionLink 2117100 - Disclosure - Reportable Business Segments link:presentationLink link:calculationLink link:definitionLink 2417402 - Disclosure - Reportable Business Segments (Details) link:presentationLink link:calculationLink link:definitionLink 2317301 - Disclosure - Reportable Business Segments (Tables) link:presentationLink link:calculationLink link:definitionLink 2113100 - Disclosure - Short-Term Borrowings and Long-term Debt link:presentationLink link:calculationLink link:definitionLink 2313301 - Disclosure - Short-Term Borrowings and Long-term Debt Credit Facilities (Tables) link:presentationLink link:calculationLink link:definitionLink 2413402 - Disclosure - Short-Term Borrowings and Long-term Debt (Details) link:presentationLink link:calculationLink link:definitionLink 2118100 - Disclosure - Subsequent Events link:presentationLink link:calculationLink link:definitionLink 2418401 - Disclosure - Subsequent Events (Details) link:presentationLink link:calculationLink link:definitionLink 2409402 - Disclosure - Unconsolidated Affiliates (Details) link:presentationLink link:calculationLink link:definitionLink 2409403 - Disclosure - Unconsolidated Affiliates Financial data (Details) link:presentationLink link:calculationLink link:definitionLink 2109100 - Disclosure - Unconsolidated Affiliates (Notes) link:presentationLink link:calculationLink link:definitionLink 2309301 - Disclosure - Unconsolidated Affiliates (Tables) link:presentationLink link:calculationLink link:definitionLink