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Recent Accounting Pronouncements (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
Recent accounting pronouncements              
Equity $ 4,304 $ 5,010 $ 5,685 $ 5,686 $ 5,502   $ 5,867
Minimum | Cumulative Effect, Period of Adoption, Adjustment              
Recent accounting pronouncements              
Equity (200)         $ (2,300)  
Maximum | Cumulative Effect, Period of Adoption, Adjustment              
Recent accounting pronouncements              
Equity $ (400)         $ (2,600)