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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