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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reconciliation of gross unrecognized tax benefits |  |  |
Beginning balance | $ 138 | $ 125 | $ 110
Additions for tax positions related to the current year | 26 | 12 | 21
Reductions for tax positions related to the current year | (3) | (1) | (1)
Additions for tax positions of prior years | 80 | 5 | 5
Reductions for tax positions of prior years | (85) | (1) | (8)
Reductions due to lapse of statutes of limitations | (5) | 0 | (1)
Audit settlements | (1) | (2) | (1)
Ending balance | 150 | 138 | 125
Unrecognized tax benefits, net of federal tax benefits, that would affect the effective tax rate if recognized | 120 | 106 | 95
Estimated decrease in gross amount of unrecognized tax benefits reasonably possible in next 12 months | 25 |  |
Interest and penalties related to unrecognized tax benefits |  |  |
Interest and penalties expense (credit) | 12 | 4 | $ 0
Payable related to accrued interest and penalties | $ 26 | $ 14 |

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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/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -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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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org//1943274/2147482525/740-10-45-10B + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15 + Details
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