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Fair Value Measurements - Level 3 Reconciliation (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Excess spread financing |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance - beginning of period | $ 1,184 | $ 996
Total gains or losses included in earnings | (74) | 74
Payments received from borrowers | 0 |
Purchases | 0 | 0
Issuances | 438 | 70
Sales | 0 | 0
Repayments | (12) | (2)
Settlements | (107) | (91)
Balance - end of period | 1,429 | 1,047
Mortgage servicing rights financing |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance - beginning of period | 32 | 10
Total gains or losses included in earnings | 11 | 6
Payments received from borrowers | 0 |
Purchases | 0 | 0
Issuances | 0 | 0
Sales | 0 | 0
Repayments | 0 | 0
Settlements | 0 | 0
Balance - end of period | 43 | 16
Mortgage servicing rights |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance - beginning of period | 3,665 | 2,937
Total gains or losses included in earnings | (724) | 144
Payments received from borrowers | 0 |
Purchases | 689 | 132
Issuances | 169 | 139
Sales | (294) | 4
Repayments | 0 | 0
Settlements | 0 | 0
Balance - end of period | 3,505 | $ 3,356
Mortgage loans held for investment |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance - beginning of period | 119 |
Total gains or losses included in earnings | 3 |
Payments received from borrowers | (8) |
Purchases | 0 |
Issuances | 0 |
Sales | 0 |
Repayments | 0 |
Settlements | 0 |
Balance - end of period | $ 114 |

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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=117815213&loc=d3e19207-110258 + Details
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