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Investments (Leased Real Estate Investments - Operating Leases) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Schedule of Operating Leases by Property Type [Line Items] |  |  |
Leased real estate investments, Carrying Value | $ 4,523 | $ 5,146 |
Office |  |  |
Schedule of Operating Leases by Property Type [Line Items] |  |  |
Leased real estate investments, Carrying Value | $ 2,206 | $ 2,322 |
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 | $ 804 | $ 938 |
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 | $ 625 | $ 828 |
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 | $ 562 | $ 635 |
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 | $ 254 | $ 339 |
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 | $ 72 | $ 84 |
Operating Lease, Lease Income | Total revenues | Total revenues | Total revenues
Other |  |  |
Schedule of Operating Leases by Property Type [Line Items] |  |  |
Leased real estate investments, Carrying Value | $ 0 | $ 0 |
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

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 45 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=123420820&loc=SL77919311-209978 + Details
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- Definition Carrying amount of income producing properties held for rental. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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