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Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
NUMERATOR: |  |  |  |
Net income | $ 608 | $ 465 | $ 1,061 | $ 617
Incremental income effect of interest on 5.25% convertible notes | 1 | 1 | 1 | 2
Net income after assumed conversion | $ 609 | $ 466 | $ 1,062 | $ 619
DENOMINATOR: |  |  |  |
Weighted-average shares outstanding, basic | 665 | 690 | 670 | 694
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 | 673 | 698 | 678 | 703
NET INCOME PER SHARE: |  |  |  |
Basic | $ 0.91 | $ 0.67 | $ 1.58 | $ 0.89
Diluted | $ 0.90 | $ 0.67 | $ 1.57 | $ 0.88

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