Commitments - Extensions of Credit (Details) - USD ($) $ in Billions |
Jun. 30, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Extended lines of credit | ||
| Commitments, guarantees: | ||
| Unused amounts in lines of credit to third-party entities and commitments for future financing to clients | $ 1.9 | $ 1.8 |
| Financing for client purchase agreements | ||
| Commitments, guarantees: | ||
| Unused amounts in lines of credit to third-party entities and commitments for future financing to clients | $ 5.7 | $ 6.3 |