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Derivative Financial Instruments - Derivative Instruments (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Treasury futures |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value |  | $ (49)
Assets |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | $ 4,925 | 7,983
Fair Value | 125 | 153
Gains/(Losses) | 119 | 161
Assets | Loan sale commitments |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 399 | 543
Fair Value | 12 | 1
Gains/(Losses) | 2 | (24)
Assets | IRLCs |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 940 | 3,122
Fair Value | 33 | 72
Gains/(Losses) | 11 | (62)
Assets | LPCs |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 484 | 203
Fair Value | 3 | 2
Gains/(Losses) | 2 | (1)
Assets | Forward MBS trades |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 1,056 | 4,658
Fair Value | 18 | 79
Gains/(Losses) | 35 | 224
Assets | Treasury futures |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 2,445 |
Fair Value | 71 |
Gains/(Losses) | 71 |
Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 1,742 | 3,001
Fair Value | (11) | (68)
Gains/(Losses) | (69) | (115)
Liabilities | IRLCs |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 25 | 551
Fair Value | 0 | (5)
Gains/(Losses) | 0 | (5)
Liabilities | LPCs |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 85 | 658
Fair Value | 0 | (8)
Gains/(Losses) | 1 | (6)
Liabilities | Forward MBS trades |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 1,439 | 695
Fair Value | (10) | (6)
Gains/(Losses) | (47) | 7
Liabilities | Treasury futures |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 193 | 1,097
Gains/(Losses) | $ (23) | $ (111)

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- Definition Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 + Details
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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
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