Fair Values (Details Textuals) - Fair Value, Nonrecurring - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
Dec. 31, 2020 |
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||||
| Carrying value of equity securities without readily determinable fair values | $ 1,300 | $ 1,300 | $ 530 | ||
| Net upward adjustments of equity securities without readily determinable fair values | 103 | $ 25 | 728 | $ 47 | |
| Cumulative net unrealized gains for equity investments without readily determinable fair values | $ 1,100 | $ 1,100 | $ 347 | ||