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Benefit Plans - Summary of Equity-Based Compensation - (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Units/Shares      
Equity-based compensation expense $ 165 $ 141 $ 132
Income tax benefit from equity-based compensation expense 38 34 34
Intrinsic value of options exercised, and RSUs and PSUs that vested during the year 216 260 261
Grant date fair value of equity-based awards that vested during the year 134 139 116
Unrecognized compensation cost related to equity-based awards $ 274 $ 135 $ 132
Weighted-average life over which compensation cost is expected to be recognized 2 years 3 months 18 days 2 years 4 months 24 days 2 years 4 months 24 days