Fair Values - Narrative (Details) - Fair Value, Nonrecurring - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||||
| Carrying value of equity securities without readily determinable fair values | $ 1,400 | $ 1,400 | $ 1,100 | ||
| Net upward adjustments of equity securities without readily determinable fair values | 278 | $ 91 | 300 | $ 91 | |
| Net downward adjustments of equity securities without readily determinable fair values | 3 | $ 0 | 13 | $ 38 | |
| Cumulative net unrealized gains for equity investments without readily determinable fair values | 1,500 | 1,500 | |||
| Cumulative net unrealized losses for equity investments without readily determinable fair values | 500 | 500 | |||
| Level 3 | |||||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||||
| Carrying value of equity securities without readily determinable fair values | $ 800 | $ 800 | $ 500 | ||