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Earnings Per Share - Schedule of Computation for Earnings Per Share Types (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 730	$ 557
Basic weighted average shares outstanding (shares)	665	704
Dilutive effect of share-based awards (shares)	2	2
Diluted weighted average shares outstanding (shares)	667	706
Basic earnings per share (USD per share)	$ 1.10	$ 0.79
Diluted earnings per share (USD per share)	$ 1.09	$ 0.79

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