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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
NUMERATOR:        
Net income $ 388 $ 584 $ 1,722 $ 1,645
Incremental income effect of interest on 5.25% convertible notes 1 1 2 3
Net income after assumed conversion $ 389 $ 585 $ 1,724 $ 1,648
DENOMINATOR:        
Weighted-average shares outstanding, basic 618 655 630 665
Dilutive effect of Employee stock options and restricted stock units 1 2 2 2
Dilutive effect of 5.25% convertible notes 6 6 6 6
Adjusted weighted-average shares outstanding, diluted 625 663 638 673
NET INCOME PER SHARE:        
Basic $ 0.63 $ 0.89 $ 2.73 $ 2.47
Diluted $ 0.62 $ 0.88 $ 2.70 $ 2.45