Fair Values - Reported (Details) - USD ($) $ in Millions |
Mar. 31, 2024 |
Dec. 31, 2023 |
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|---|---|---|---|---|
| Estimate of Fair Value Measurement [Member] | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Long-Term Debt, Fair Value | [1] | $ 19,206 | $ 19,377 | |
| Reported Value Measurement [Member] | ||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
| Long-Term Debt, Fair Value | [1] | $ 20,557 | $ 20,547 | |
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