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Income Taxes (Unrecognized Income Tax Benefits) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns      
Balance at January 1 $ 488 $ 506 $ 497
Gross increases for tax positions of prior years 38 22 62
Gross decreases for tax positions of prior years (13) (38) (37)
Gross increases for tax positions of the current year 109 36 42
Settlements (26) (21) (39)
Other (8) (17) (19)
Balance at December 31 $ 588 $ 488 $ 506