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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Basic EPS Calculation      
Earnings available to common stockholders - Basic $ 2,924 $ 14,824 $ 9,195
Weighted-average number of common shares outstanding (in shares) 1,882 1,897 1,882
Add: Deferred awards held as stock units (in shares) 0 1 1
Total weighted-average number of common shares outstanding (in shares) 1,882 1,898 1,883
Earnings per share of common stock - Basic (in dollars per share) $ 1.55 $ 7.81 $ 4.88
Diluted EPS Calculation      
Earnings available to common stockholders - Diluted $ 2,924 $ 14,824 $ 9,195
Weighted-average number of common shares outstanding (in shares) 1,882 1,897 1,882
Add: Deferred awards held as stock units (in shares) 0 1 1
Add: Dilutive effect of employee stock-based awards (in shares) 13 16 15
Total weighted-average number of common shares outstanding (in shares) 1,895 1,914 1,898
Earnings per share of common stock - Diluted (in dollars per share) $ 1.54 $ 7.74 $ 4.85