Investment Securities (Details 3) $ in Millions |
Mar. 31, 2022
USD ($)
security
|
Dec. 31, 2021
USD ($)
security
|
|---|---|---|
| Debt Securities, Available-for-sale [Line Items] | ||
| Number of Securities, Less than 12 months | security | 48 | 5 |
| Estimated Fair Value, Less than 12 months | $ 3,038 | $ 477 |
| Gross Unrealized Losses, Less than 12 months | $ (17) | $ (1) |
| 90–100% | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Number of Securities, Less than 12 months | security | 44 | 5 |
| Estimated Fair Value, Less than 12 months | $ 3,032 | $ 477 |
| Gross Unrealized Losses, Less than 12 months | $ (16) | $ (1) |
| Less than 90% | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Number of Securities, Less than 12 months | security | 4 | |
| Estimated Fair Value, Less than 12 months | $ 6 | |
| Gross Unrealized Losses, Less than 12 months | $ (1) |