Income Taxes - Tax Carryforwards and Unrecognized Tax Benefits (Details) - USD ($) $ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Operating Loss and Tax Credit Carryforwards [Line Items] | ||
| Net operating loss carryforwards | $ 278 | $ 233 |
| Tax credit carryforwards | 3,591 | $ 3,057 |
| Federal [Member] | ||
| Operating Loss and Tax Credit Carryforwards [Line Items] | ||
| Tax credit carryforwards | 3,208 | |
| State [Member] | ||
| Operating Loss and Tax Credit Carryforwards [Line Items] | ||
| Net operating loss carryforwards | 259 | |
| Tax credit carryforwards | 376 | |
| Net operating loss carryforwards with indefinite expiration period | 92 | |
| Tax credit carryforward with indefinite expiration period | 201 | |
| Foreign [Member] | ||
| Operating Loss and Tax Credit Carryforwards [Line Items] | ||
| Net operating loss carryforwards | 19 | |
| Tax credit carryforwards | 7 | |
| Net operating loss carryforwards with indefinite expiration period | $ 1 |