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Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
NUMERATOR:
Net income	$ 351	$ 513
Incremental income effect of interest on 5.25% convertible notes	0	1
Net income after assumed conversion	$ 351	$ 514
DENOMINATOR:
Weighted-average shares outstanding, basic	613	641
Dilutive effect of Employee stock options and restricted stock units	1	1
Dilutive effect of 5.25% convertible notes	0	6
Adjusted weighted-average shares outstanding, diluted	614	648
NET INCOME PER SHARE:
Basic	$ 0.57	$ 0.80
Diluted	$ 0.57	$ 0.79

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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