Fair Values (Details Textuals) - Fair Value, Nonrecurring - USD ($) |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2022 |
Mar. 31, 2021 |
Dec. 31, 2021 |
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||
| Assets measured at fair value for impairment | $ 0 | $ 0 | |
| Carrying value of equity securities without readily determinable fair values | 1,300,000,000 | 1,300,000,000 | |
| Net upward adjustments of equity securities without readily determinable fair values | 12,000,000 | $ 378,000,000 | |
| Net downward adjustments of equity securities without readily determinable fair values | 18,000,000 | $ 1,000,000 | |
| Cumulative net unrealized gains for equity investments without readily determinable fair values | 1,100,000,000 | 1,100,000,000 | |
| Cumulative net unrealized losses for equity investments without readily determinable fair values | $ 29,000,000 | $ 10,000,000 | |