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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
NUMERATOR:
Net income	$ 659	$ 615	$ 1,787	$ 1,811
DENOMINATOR:
Weighted-average shares outstanding, basic	533	569	542	578
Dilutive effect of restricted stock units	1	0	1	1
Adjusted weighted-average shares outstanding, diluted	534	569	543	579
NET INCOME PER SHARE:
Basic	$ 1.24	$ 1.08	$ 3.30	$ 3.13
Diluted	$ 1.23	$ 1.08	$ 3.29	$ 3.13

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