Investments (Commercial Mortgage and Other Loans) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 62,835	$ 59,124
Other loans	845	834
Total commercial mortgage and other loans	$ 63,559	$ 59,830
% of Total	100.00%	100.00%
Net carrying value of commercial loans held for sale	$ 228	$ 763
Commercial Mortgage Loans
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 59,363	$ 55,808
% of Total	94.50%	94.40%
Commercial mortgage and agricultural property loans
Commercial Mortgage and Other Loans [Line Items]
Allowance for credit losses, Commercial mortgage and agricultural property loans	$ (117)	$ (123)
Total net loans	62,718	59,001
Uncollateralized loans
Commercial Mortgage and Other Loans [Line Items]
Other loans	656	660
Residential property loans
Commercial Mortgage and Other Loans [Line Items]
Other loans	124	157
Other collateralized loans
Commercial Mortgage and Other Loans [Line Items]
Other loans	65	17
Other loans
Commercial Mortgage and Other Loans [Line Items]
Total net loans	841	829
Allowance for credit losses, Other loans	(4)	(5)
Office
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 13,462	$ 13,280
% of Total	21.40%	22.40%
Retail
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 8,379	$ 8,639
% of Total	13.30%	14.60%
Apartment/Multi-Family
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 17,348	$ 16,538
% of Total	27.60%	28.00%
Industrial
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 13,226	$ 11,574
% of Total	21.10%	19.60%
Hospitality
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 2,415	$ 1,931
% of Total	3.90%	3.30%
Other
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 4,533	$ 3,846
% of Total	7.20%	6.50%
Agricultural property loans
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 3,472	$ 3,316
% of Total	5.50%	5.60%

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Commercial mortgage loans, Percentage

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