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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Earnings Per Share [Abstract]    
Earnings available to common stockholders $ 292 $ 145
Basic weighted-average shares outstanding (in shares) 267.0 283.9
Effect of employee stock awards (in shares) 1.3 1.0
Diluted weighted-average shares outstanding (in shares) 268.3 284.9
Earnings per share, basic and diluted (in dollars per share) $ 1.09 $ 0.51 [1]
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.