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Investments (Commercial Mortgage and Other Loans) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Commercial Mortgage and Other Loans [Line Items]    
Total commercial mortgage and agricultural property loans by property type $ 58,647 $ 55,287
Other loans 811 864
Total commercial mortgage and other loans [1] $ 59,336 $ 56,045
% of Total 100.00% 100.00%
Net carrying value of commercial loans held for sale $ 401 $ 593
Commercial Mortgage Loans    
Commercial Mortgage and Other Loans [Line Items]    
Total commercial mortgage and agricultural property loans by property type $ 55,358 $ 52,084
% of Total 94.40% 94.20%
Commercial mortgage and agricultural property loans    
Commercial Mortgage and Other Loans [Line Items]    
Valuation allowance, Commercial mortgage and agricultural property loans $ (117) $ (100)
Total net loans 58,530 55,187
Uncollateralized loans    
Commercial Mortgage and Other Loans [Line Items]    
Other loans 647 663
Residential property loans    
Commercial Mortgage and Other Loans [Line Items]    
Other loans 161 196
Other collateralized loans    
Commercial Mortgage and Other Loans [Line Items]    
Other loans 3 5
Other loans    
Commercial Mortgage and Other Loans [Line Items]    
Total net loans 806 858
Valuation allowance, Other loans (5) (6)
Office    
Commercial Mortgage and Other Loans [Line Items]    
Total commercial mortgage and agricultural property loans by property type $ 13,309 $ 12,670
% of Total 22.70% 22.90%
Retail    
Commercial Mortgage and Other Loans [Line Items]    
Total commercial mortgage and agricultural property loans by property type $ 8,851 $ 8,543
% of Total 15.10% 15.50%
Apartments/Multi-Family    
Commercial Mortgage and Other Loans [Line Items]    
Total commercial mortgage and agricultural property loans by property type $ 16,370 $ 15,465
% of Total 27.90% 28.00%
Industrial    
Commercial Mortgage and Other Loans [Line Items]    
Total commercial mortgage and agricultural property loans by property type $ 11,151 $ 9,451
% of Total 19.00% 17.10%
Hospitality    
Commercial Mortgage and Other Loans [Line Items]    
Total commercial mortgage and agricultural property loans by property type $ 1,948 $ 2,067
% of Total 3.30% 3.70%
Other    
Commercial Mortgage and Other Loans [Line Items]    
Total commercial mortgage and agricultural property loans by property type $ 3,729 $ 3,888
% of Total 6.40% 7.00%
Agricultural property loans    
Commercial Mortgage and Other Loans [Line Items]    
Total commercial mortgage and agricultural property loans by property type $ 3,289 $ 3,203
% of Total 5.60% 5.80%
[1] See Note 4 for details of balances associated with variable interest entities.