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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
NUMERATOR:        
Net income $ 584 $ 329 $ 1,645 $ 946
Incremental income effect of interest on 5.25% convertible notes 1 1 3 3
Net income after assumed conversion $ 585 $ 330 $ 1,648 $ 949
DENOMINATOR:        
Weighted-average shares outstanding, basic 655 683 665 690
Dilutive effect of Employee stock options and restricted stock units 2 2 2 3
Dilutive effect of 5.25% convertible notes 6 6 6 6
Adjusted weighted-average shares outstanding, diluted 663 691 673 699
NET INCOME PER SHARE:        
Basic $ 0.89 $ 0.48 $ 2.47 $ 1.37
Diluted $ 0.88 $ 0.48 $ 2.45 $ 1.36