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Recent Accounting Pronouncements (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Cumulative-effect decrease to beginning retained earnings $ (32,324) $ (32,532) $ (33,070) $ (32,429) $ (33,028)   $ (34,595)
Cumulative Effect, Period of Adoption, Adjustment              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Cumulative-effect decrease to beginning retained earnings             45
Retained Earnings              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Cumulative-effect decrease to beginning retained earnings $ (14,442) $ (14,014) $ (13,441) $ (13,141) $ (12,877)   (12,528)
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Cumulative-effect decrease to beginning retained earnings             $ 45
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Cumulative-effect decrease to beginning retained earnings           $ 45