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Investments - Detail of equity method investments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Schedule of Investments [Line Items] |  |  |  |  |
Investments accounted for using the equity method | $ 1,626 |  | $ 1,626 |  | $ 1,517
Equity in earnings of partnerships and similar investments | 76 | $ 71 | 209 | $ 149 |
Real estate-related investments |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments accounted for using the equity method | 1,193 |  | 1,193 |  | 1,130
Equity in earnings of partnerships and similar investments | 69 | 45 | 169 | 99 |
Private equity |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments accounted for using the equity method | 402 |  | 402 |  | 352
Equity in earnings of partnerships and similar investments | 5 | 24 | 38 | 45 |
Private debt |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investments accounted for using the equity method | 31 |  | 31 |  | $ 35
Equity in earnings of partnerships and similar investments | $ 2 | $ 2 | $ 2 | $ 5 |

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(10)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8813-108599 + Details
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