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Shareholders' Equity (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Balance     $ 15,770  
Net current-period other comprehensive income $ (101) $ 55 (294) $ 530
Balance 13,978   13,978  
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Balance [1] (693) (871) (529) (1,275)
Other comprehensive income [1],[2] (128) 49 (281) 435
Equity method affiliates [1],[3]   4 (11) 22
Net current-period other comprehensive income [1] (128) 53 (292) 457
Balance [1] $ (821) $ (818) (821) (818)
Other Comprehensive Income, Tax     $ 28 $ 47
[1] All amounts are after tax. Amounts in parentheses indicate debits to accumulated other comprehensive loss.
[2] For the three months ended September 30, 2018 and 2017, tax amounts are not significant. For the nine months ended September 30, 2018 and 2017, amounts are net of tax benefit of $28 million and tax expense of $47 million, respectively.
[3] Tax effects are not significant.