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Recent Accounting Pronouncements (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' equity, including portion attributable to noncontrolling interest $ 31,672 $ 33,070   $ 34,595 $ 2,293
Retained Earnings          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' equity, including portion attributable to noncontrolling interest $ 14,846 $ 13,441   12,528 $ 11,635
Cumulative Effect, Period of Adoption, Adjustment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' equity, including portion attributable to noncontrolling interest       (45)  
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' equity, including portion attributable to noncontrolling interest       $ (45)  
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings | Accounting Standards Update 2016-13          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' equity, including portion attributable to noncontrolling interest     $ (45)