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Investments (Real Estate and Real Estate Joint Ventures) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Real Estate [Line Items]          
Leased real estate investments, Carrying Value $ 4,366   $ 4,366   $ 4,523
Other real estate investments, Carrying Value 491   491   487
Real estate joint ventures, Carrying Value 8,188   8,188   8,127
Real Estate Investments, Net 13,045   13,045   $ 13,137
Income (Loss) from Equity Method Investments 172 $ 386 79 $ 1,474  
Real Estate and Real Estate Joint Ventures          
Real Estate [Line Items]          
Gross Investment Income, Operating 137 379 163 707  
Leased real estate          
Real Estate [Line Items]          
Operating Lease, Lease Income 90 98 182 204  
Other real estate          
Real Estate [Line Items]          
Income from other real estate investments 85 68 135 100  
Real estate joint ventures          
Real Estate [Line Items]          
Income (Loss) from Equity Method Investments $ (38) $ 213 $ (154) $ 403