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Commitments, Contingencies and Guarantees (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]    
Loss Contingency, Range of Possible Loss, Portion Not Accrued $ 20  
Long-term Purchase Commitment [Line Items]    
Fannie Mae DUS Servicing Portfolio, Amount 4,900 $ 4,700
Maximum Quantifiable Fannie Mae DUS Loss Share Guarantee 1,700 1,700
Estimated Fair Value of the Fannie Mae DUS Loss Share Guarantee 7 7
Fannie Mae Servicing Portfolio, Other, Amount 493 $ 400
Loss Contingency, Receivable 50  
Civil monetary penalty 50  
Customer redress $ 141