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Commitments, Contingencies and Guarantees (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
 [1]
Long-term Purchase Commitment [Line Items]          
Litigation Settlement Civil Monetary Penalty   $ 50      
Litigation Settlement Customer Redress   $ 141      
Fannie Mae DUS Servicing Portfolio, Amount $ 4,900   $ 4,900 $ 4,700  
Fannie Mae Servicing Portfolio, Other, Amount 655   655 400  
Maximum Quantifiable Fannie Mae Loss Share Guarantee 1,800   1,800 1,700  
Insurance proceeds $ 50   $ 50 [1] $ 0 [1] $ 0
[1] In the third quarter of 2022, the Company settled a previously disclosed matter with the CFPB. The Company received an insurance reimbursement related to the settlement in the fourth quarter of 2022.