Securities - Narrative (Details) - USD ($) $ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Investments, Debt And Equity Securities [Line Items] | ||
| Equity securities, fair value | $ 253 | $ 247 |
| Equity securities, cost | 479 | 438 |
| Recurring | ||
| Investments, Debt And Equity Securities [Line Items] | ||
| Time deposits placed and other short-term investments | 1,242 | 1,318 |
| Available-for-sale debt securities | ||
| Investments, Debt And Equity Securities [Line Items] | ||
| Accumulated net unrealized loss on AFS debt securities | 1,300 | |
| Accumulated other comprehensive loss, tax benefit | 437 | |
| U.S. Agency And U.S. Treasury Securities | ||
| Investments, Debt And Equity Securities [Line Items] | ||
| AFS and HTM debt securities | 863,700 | 871,100 |
| All Non U.S. Agency And Non U.S. Treasury Securities | ||
| Investments, Debt And Equity Securities [Line Items] | ||
| AFS and HTM debt securities | $ 47,600 | $ 37,500 |