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Business, Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 USD ($) Segment | Jan. 01, 2024 USD ($) | Dec. 31, 2023 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Number of segments | Segment | 6 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Retained earnings, decrease | $ (40,350) |  | $ (40,146)
Cumulative Effect, Period of Adoption, Adjustment | Pro Forma | Accounting Standards Update 2023-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Retained earnings, decrease |  | $ 219 |

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