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Debt - Schedule of Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Carrying value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total debt | $ 32,116 | $ 31,788
Estimated fair value(a) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total debt | 31,370 | 30,070
Estimated fair value(a) | Capital Trust I | Trust I preferred securities, 4.75%, due March 2028 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Convertible Debt | $ 207 | $ 195

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