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Restructuring and Transaction Costs (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring and transaction costs | $ 0 | $ 0 | $ 258
Merger Integration [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring and transaction costs |  |  | 210
Noncash restructuring costs |  |  | 21
Transaction Costs [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Underwriting, bank, legal and accounting fees |  |  | 48
Reduction of workforce [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Noncash restructuring costs |  |  | 66
Reduction of workforce [Member] | Defined Benefit Settlements [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring and transaction costs |  |  | $ 41

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