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Customer Deposits (Details 3) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Time Deposits $250,000 Or More [Line Items]    
Time Deposits, $250,000 or More $ 746 $ 931
U.S.    
Time Deposits $250,000 Or More [Line Items]    
Time Deposits, $250,000 or More 745 930
Non-U.S.    
Time Deposits $250,000 Or More [Line Items]    
Time Deposits, $250,000 or More $ 1 $ 1