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Leases (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Lessee, Lease, Description [Line Items] |  |  |
Leases with options to extend | 20 years |  |
Leases with options to terminate | 7 years |  |
Operating leases that have not yet commenced | $ 190 |  |
Operating lease costs | 121 | $ 133 | $ 153
Short-term lease costs | 74 | 80 | 96
Net investment income |  |  |
Income and Expenses, Lessor [Abstract] |  |  |
Lease Income | 79 | 85 | 100
Other Income |  |  |
Income and Expenses, Lessor [Abstract] |  |  |
Lease Income | $ 11 | $ 12 | $ 15
Minimum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Remaining lease terms | 1 year |  |
Operating lease term not yet commenced | 5 years |  |
Maximum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Remaining lease terms | 25 years |  |
Operating lease term not yet commenced | 15 years |  |

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- Definition Term of lessee's operating lease termination, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of lease income from operating, direct financing, and sales-type leases. Includes, but is not limited to, variable lease payments, interest income, profit (loss) recognized at commencement, and lease payments paid and payable to lessor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479773/842-30-50-5 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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