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Derivative Financial Instruments - Derivative Instruments (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021
Assets |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | $ 4,256 | $ 18,523
Fair Value | 77 | 241
Gains/(Losses) | 360 | 33
Assets | Loan sale commitments |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 246 | 1,514
Fair Value | 8 | 39
Gains/(Losses) | (17) | (63)
Assets | IRLCs |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 2,103 | 6,730
Fair Value | 62 | 204
Gains/(Losses) | (72) | (210)
Assets | LPCs |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 325 | 1,984
Fair Value | 3 | 10
Gains/(Losses) | 0 | (29)
Assets | Forward MBS trades |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 1,798 | 9,749
Fair Value | 12 | 27
Gains/(Losses) | 429 | 271
Assets | Swap futures |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional |  | 60
Fair Value |  | 0
Gains/(Losses) |  | 1
Assets | Treasury futures |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 30 |
Fair Value | 0 |
Gains/(Losses) | 3 |
Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 2,860 | 12,464
Fair Value | 33 | 26
Gains/(Losses) | (216) | (131)
Liabilities | IRLCs |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 56 | 9
Fair Value | 1 | 0
Gains/(Losses) | (1) | 0
Liabilities | LPCs |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 186 | 708
Fair Value | 1 | 1
Gains/(Losses) | 1 | (1)
Liabilities | Forward MBS trades |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 1,716 | 11,747
Fair Value | 13 | 25
Gains/(Losses) | (31) | (126)
Liabilities | Swap futures |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional |  | 0
Fair Value |  | 0
Gains/(Losses) |  | $ (4)
Liabilities | Treasury futures |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 902 |
Fair Value | 18 |
Gains/(Losses) | $ (185) |

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- Definition Fair value, before effects of master netting arrangements, of a 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. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=121570589&loc=SL51823488-111719 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959 + Details
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