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Loan Servicing - Commercial Mortgage Banking Activities (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Servicing Assets at Fair Value [Line Items]    
MSRs at fair value $ 3,303 $ 3,758
CRE    
Servicing Assets at Fair Value [Line Items]    
UPB of CRE mortgages serviced for others 36,245 36,622
Mortgage loans sold with recourse 9,829 9,955
Maximum recourse exposure from CRE mortgages sold with recourse liability 2,820 2,861
Recorded reserves related to recourse exposure 16 17
CRE mortgages originated during the year-to-date period 1,041 7,779
MSRs at fair value $ 291 $ 301