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Investments (Leased Real Estate Investments - Operating Leases) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule of Operating Leases by Property Type [Line Items] |  |  |
Leased real estate investments, Carrying Value | $ 4,446 | $ 4,523 |
Office |  |  |
Schedule of Operating Leases by Property Type [Line Items] |  |  |
Leased real estate investments, Carrying Value | $ 2,221 | $ 2,206 |
Operating Lease, Lease Income | Total revenues | Total revenues | Total revenues
Retail |  |  |
Schedule of Operating Leases by Property Type [Line Items] |  |  |
Leased real estate investments, Carrying Value | $ 753 | $ 804 |
Operating Lease, Lease Income | Total revenues | Total revenues | Total revenues
Apartment |  |  |
Schedule of Operating Leases by Property Type [Line Items] |  |  |
Leased real estate investments, Carrying Value | $ 641 | $ 625 |
Operating Lease, Lease Income | Total revenues | Total revenues | Total revenues
Land |  |  |
Schedule of Operating Leases by Property Type [Line Items] |  |  |
Leased real estate investments, Carrying Value | $ 564 | $ 562 |
Operating Lease, Lease Income | Total revenues | Total revenues | Total revenues
Industrial |  |  |
Schedule of Operating Leases by Property Type [Line Items] |  |  |
Leased real estate investments, Carrying Value | $ 200 | $ 254 |
Operating Lease, Lease Income | Total revenues | Total revenues | Total revenues
Hotel |  |  |
Schedule of Operating Leases by Property Type [Line Items] |  |  |
Leased real estate investments, Carrying Value | $ 67 | $ 72 |
Operating Lease, Lease Income | Total revenues | Total revenues | Total revenues
Leased real estate |  |  |
Schedule of Operating Leases by Property Type [Line Items] |  |  |
Operating Lease, Lease Income | Total revenues | Total revenues | Total revenues
Other real estate |  |  |
Schedule of Operating Leases by Property Type [Line Items] |  |  |
Operating Lease, Lease Income | Total revenues | Total revenues | Total revenues

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- Definition Indicates line item in statement of comprehensive income that includes operating lease income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479016/842-30-45-3 + Details
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- Definition Carrying amount of income producing properties held for rental. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(d)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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