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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Uncertainties [Abstract]      
Balance at January 1 $ 1,442 $ 1,515 $ 1,458
Additions for tax positions related to the current year 84 89 106
Additions for tax positions of prior years 164 5 23
Reductions for tax positions of prior years (13) (141) (56)
Settlements (414) (26) (16)
Balance at December 31 1,263 1,442 1,515
Gross interest expense related to unrecognized tax benefits 127 62 34
Total accrued interest balance at December 31 $ 255 $ 233 $ 190