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Debt - Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Carrying value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total debt | $ 31,711 | $ 32,116
Estimated fair value(a) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total debt | 30,540 | 31,370
Estimated fair value(a) | Capital Trust I | Trust I preferred securities, 4.75%, due March 2028(b) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Convertible debt | $ 206 | $ 207

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