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Income Taxes - Reconciliation Rollforward of Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Reconciliation of gross unrecognized tax benefits |  |  |
Beginning balance | $ 150 | $ 138 | $ 125
Additions for tax positions related to the current year | 22 | 26 | 12
Reductions for tax positions related to the current year | (2) | (3) | (1)
Additions for tax positions of prior years | 23 | 80 | 5
Reductions for tax positions of prior years | (8) | (85) | (1)
Reductions due to lapse of statutes of limitations | (20) | (5) | 0
Audit settlements | (1) | (1) | (2)
Ending balance | 164 | 150 | 138
Unrecognized tax benefits, net of federal tax benefits, that would affect the effective tax rate if recognized | 134 | 120 | 106
Estimated decrease in gross amount of unrecognized tax benefits reasonably possible in next 12 months | 16 |  |
Interest and penalties related to unrecognized tax benefits |  |  |
Interest and penalties expense (credit) | 5 | 12 | $ 4
Payable related to accrued interest and penalties | 31 | 26 |
Estimated CAMT | $ 131 | $ 0 |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (d)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15 + Details
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