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Income Taxes (Unrecognized Income Tax Benefits) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns      
Balance at January 1 $ 354 $ 321 $ 406
Gross increases for tax positions of prior years 75 50 20
Gross decreases for tax positions of prior years (86) (23) (104)
Gross increases for tax positions of the current year 41 37 39
Settlements (70) (19) (29)
Other (16) (12) (11)
Balance at December 31 $ 298 $ 354 $ 321