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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