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 | ||||
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