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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share [Abstract]        
Earnings available to common stockholders $ 1,052 $ 683 $ 1,344 $ 828
Basic weighted-average shares outstanding (in shares) 260.8 274.7 263.9 279.3
Effect of employee stock awards (in shares) 0.8 0.9 1.0 0.9
Diluted weighted-average shares outstanding (in shares) 261.6 275.6 264.9 280.2
Earnings per share, basic (in dollars per share) $ 4.03 $ 2.48 [1] $ 5.09 $ 2.96 [1]
Earnings per share, diluted (in dollars per share) $ 4.02 $ 2.48 [1] $ 5.07 $ 2.95 [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.