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Fair Value of Assets and Liabilities - Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value (Details) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Beginning balance |  |  | $ (14,000,000) | $ (23,000,000)
Total net gains (losses) included in net income |  |  | (9,000,000) | (1,000,000)
Purchases |  |  | 0 | 0
Sales |  |  | 0 | 0
Settlements |  |  | 5,000,000 | 5,000,000
Net transfers into (out of) Level 3 |  |  | 0 | 0
Ending balance | $ (18,000,000) | $ (19,000,000) | (18,000,000) | (19,000,000)
Net unrealized gains (losses) included in net income |  |  | (9,000,000) | (1,000,000)
Fair value, asset (liability), unrealized gain (loss), OCI |  |  |  | 0
Level 3 |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Beginning balance | (21,000,000) | (21,000,000) |  |
Total net gains (losses) included in net income | 0 | 0 |  |
Purchases | 0 | 0 |  |
Sales | 0 | 0 |  |
Settlements | 3,000,000 | 2,000,000 |  |
Net transfers into (out of) Level 3 | 0 | 0 |  |
Ending balance | (18,000,000) | (19,000,000) | (18,000,000) | (19,000,000)
Net unrealized gains (losses) included in net income | 0 | 0 |  |
Fair value, asset (liability), unrealized gain (loss), OCI |  |  | 0 |
Trading securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance |  |  |  | 1,000,000
Total net gains (losses) included in net income |  |  |  | 0
Purchases |  |  |  | 0
Sales |  |  |  | 0
Settlements |  |  |  | 0
Net transfers into (out of) Level 3 |  |  |  | 0
Ending balance |  | 1,000,000 |  | 1,000,000
Net unrealized gains (losses) included in net income |  |  |  | 0
Trading securities | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance |  | 1,000,000 |  |
Total net gains (losses) included in net income |  | 0 |  |
Purchases |  | 0 |  |
Sales |  | 0 |  |
Settlements |  | 0 |  |
Net transfers into (out of) Level 3 |  | 0 |  |
Ending balance |  | 1,000,000 |  | 1,000,000
Net unrealized gains (losses) included in net income |  | 0 |  |
Interest- only strips- AFS |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance |  |  | 32,000,000 | 19,000,000
Total net gains (losses) included in net income |  |  | 4,000,000 | (2,000,000)
Purchases |  |  | 0 | 5,000,000
Sales |  |  | (33,000,000) | (9,000,000)
Settlements |  |  | 0 | 0
Net transfers into (out of) Level 3 |  |  | 27,000,000 | 12,000,000
Ending balance | 30,000,000 | 25,000,000 | 30,000,000 | 25,000,000
Net unrealized gains (losses) included in net income |  |  | 1,000,000 | (2,000,000)
Interest- only strips- AFS | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 22,000,000 | 23,000,000 |  |
Total net gains (losses) included in net income | (1,000,000) | (1,000,000) |  |
Purchases | 0 | 0 |  |
Sales | (6,000,000) | 0 |  |
Settlements | 0 | 0 |  |
Net transfers into (out of) Level 3 | 15,000,000 | 3,000,000 |  |
Ending balance | 30,000,000 | 25,000,000 | 30,000,000 | 25,000,000
Net unrealized gains (losses) included in net income | (1,000,000) | (1,000,000) |  |
Loans held for sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance |  |  | 12,000,000 | 14,000,000
Total net gains (losses) included in net income |  |  | 2,000,000 | 1,000,000
Purchases |  |  | 5,000,000 | 0
Sales |  |  | (10,000,000) | 0
Settlements |  |  | (2,000,000) | (2,000,000)
Net transfers into (out of) Level 3 |  |  | 18,000,000 | 0
Ending balance | 25,000,000 | 13,000,000 | 25,000,000 | 13,000,000
Net unrealized gains (losses) included in net income |  |  | 2,000,000 | 1,000,000
Loans held for sale | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 12,000,000 | 14,000,000 |  |
Total net gains (losses) included in net income | 1,000,000 | 0 |  |
Purchases | 5,000,000 | 0 |  |
Sales | (10,000,000) | 0 |  |
Settlements | (1,000,000) | (1,000,000) |  |
Net transfers into (out of) Level 3 | 18,000,000 | 0 |  |
Ending balance | 25,000,000 | 13,000,000 | 25,000,000 | $ 13,000,000
Net unrealized gains (losses) included in net income | 1,000,000 | $ 0 |  |
Loans held for investment |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance |  |  | 16,000,000 |
Total net gains (losses) included in net income |  |  | 0 |
Purchases |  |  | 0 |
Sales |  |  | 0 |
Settlements |  |  | (2,000,000) |
Net transfers into (out of) Level 3 |  |  | (14,000,000) |
Ending balance | 0 |  | 0 |
Net unrealized gains (losses) included in net income |  |  | 0 |
Loans held for investment | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 17,000,000 |  |  |
Total net gains (losses) included in net income | 0 |  |  |
Purchases | 0 |  |  |
Sales | 0 |  |  |
Settlements | 0 |  |  |
Net transfers into (out of) Level 3 | (17,000,000) |  |  |
Ending balance | 0 |  | $ 0 |
Net unrealized gains (losses) included in net income | $ 0 |  |  |

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- Definition Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from asset (liability) measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Amount of unrealized gain (loss) recognized in income for derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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