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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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
NUMERATOR:
Net income	$ 741	$ 733	$ 1,128	$ 1,195
DENOMINATOR:
Weighted-average shares outstanding, basic	542	578	547	582
Dilutive effect of restricted stock units	0	1	0	1
Adjusted weighted-average shares outstanding, diluted	542	579	547	583
NET INCOME PER SHARE:
Basic	$ 1.37	$ 1.27	$ 2.06	$ 2.05
Diluted	$ 1.37	$ 1.27	$ 2.06	$ 2.05
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive amounts excluded from calculations	1	1	1	1

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