Financial Instruments: (Qualifying Hedging Activity Reported in Accumulated Other Comprehensive Earnings (Losses) Net of Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ (9,446)	$ (6,311)	$ (8,208)
Ending balance	(9,870)	(9,446)	(6,311)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	241	266	4
Derivative (gains)/losses transferred to earnings	(213)	(220)	(219)
Change in fair value	439	195	481
Ending balance	$ 467	$ 241	$ 266

Amount after tax, before reclassification adjustments of other comprehensive income (loss).

Amount after tax of reclassification adjustments of other comprehensive income (loss).

Amount of equity (deficit) attributable to parent and noncontrolling interest. Excludes temporary equity.

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+ Details