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Consolidated Statements of Comprehensive Income (Parentheticals) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Statement of Comprehensive Income [Abstract]        
Foreign currency translation, tax $ (20) $ 34 $ 17 $ (66)
Derivative financial instruments:        
Gains (losses) deferred, tax 3 0 3 (1)
(Gains) losses reclassified to earnings, tax (3) (1) (3) (1)
Available-for-sale securities        
Gains (losses) deferred, tax 0 0 0 0
(Gains) losses reclassified to earnings, tax $ 0 $ 0 $ 0 $ 0