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Income Taxes (Unrecognized Income Tax Benefits) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns      
Balance at January 1 $ 298 $ 354 $ 321
Gross increases for tax positions of prior years 36 75 50
Gross decreases for tax positions of prior years (13) (86) (23)
Gross increases for tax positions of the current year 87 41 37
Settlements (13) (70) (19)
Other (12) (16) (12)
Balance at December 31 $ 383 $ 298 $ 354