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Consolidated Statements of Comprehensive Income (Parentheticals) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Comprehensive Income [Abstract]        
Foreign currency translation, tax $ (31) $ 54 $ (15) $ 64
Derivative financial instruments:        
Gains (losses) deferred, tax (29) 8 (22) 14
(Gains) losses reclassified to earnings, tax 28 (9) 23 (16)
Available-for-sale securities        
Gains (losses) deferred, tax 0 0 0 0
(Gains) losses reclassified to earnings, tax $ 0 $ 0 $ 0 $ 0