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Income Taxes (Unrecognized Income Tax Benefits) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns      
Balance at January 1 $ 506 $ 497 $ 383
Gross increases for tax positions of prior years 22 62 144
Gross decreases for tax positions of prior years (38) (37) (34)
Gross increases for tax positions of the current year 36 42 36
Settlements (21) (39) (22)
Other (17) (19) (10)
Balance at December 31 $ 488 $ 506 $ 497