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Summary of Significant Accounting Policies - Basis of Presentation (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2021
line_of_business
Dec. 31, 2021
USD ($)
Dec. 31, 2021
segment
Accounting Policies [Abstract]        
Number of lines of business   2   2
HTM debt securities transferred     $ 438  
Unrecognized gain (loss) in AOCI $ 72      
Gain (loss) from sale of transferred securities     $ 58