Fair Value Measurements - Reconciles Beginning and Ending Balances Level 3 Residual Assets Fair Value Recurring Basis (Details) (Details) - Securitization residual assets - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2020 |
Jun. 30, 2019 |
Jun. 30, 2020 |
Jun. 30, 2019 |
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | ||||
| Balance, beginning of period | $ 118 | $ 77 | $ 122 | $ 71 |
| Accretion of securitization residual assets | 1 | 1 | 3 | 2 |
| Purchases of investments | 14 | 5 | 26 | 11 |
| Principal payments on investments | (3) | (4) | (4) | (5) |
| Sale of investments | 0 | 0 | (21) | 0 |
| Unrealized gains (losses) on investments recorded in OCI | 5 | 0 | 9 | 0 |
| Balance, end of period | $ 135 | $ 79 | $ 135 | $ 79 |
| X | ||||||||||
- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Accretion No definition available.
|
| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
|
| X | ||||||||||
- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|