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Investments (Real Estate and Real Estate Joint Ventures) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Real Estate [Line Items]          
Leased real estate investments, Carrying Value $ 5,216   $ 5,216   $ 5,450
Other real estate investments, Carrying Value 455   455   419
Real estate joint ventures, Carrying Value 6,511   6,511   6,064
Real Estate Investments, Net 12,182   12,182   $ 11,933
Income (Loss) from Equity Method Investments 1,700 $ 510 4,000 $ 145  
Real Estate and Real Estate Joint Ventures          
Real Estate [Line Items]          
Gross Investment Income, Operating 279 104 660 371  
Leased real estate investments          
Real Estate [Line Items]          
Operating Lease, Lease Income 108 115 327 322  
Other real estate investments          
Real Estate [Line Items]          
Operating Lease, Lease Income 58 34 144 93  
Real estate joint ventures          
Real Estate [Line Items]          
Income (Loss) from Equity Method Investments $ 113 $ (45) $ 189 $ (44)