Investments (Commercial Mortgage and Other Loans) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 62,832	$ 62,835
Other loans	967	845
Total commercial mortgage and other loans	$ 63,559	$ 63,559
% of Total	100.00%	100.00%
Net carrying value of commercial loans held for sale	$ 670	$ 228
Commercial Mortgage Loans
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 59,167	$ 59,363
% of Total	94.20%	94.50%
Commercial mortgage and agricultural property loans
Commercial Mortgage and Other Loans [Line Items]
Allowance for credit losses, Commercial mortgage and agricultural property loans	$ (233)	$ (117)
Total net loans	62,599	62,718
Uncollateralized loans
Commercial Mortgage and Other Loans [Line Items]
Other loans	660	656
Residential property loans
Commercial Mortgage and Other Loans [Line Items]
Other loans	115	124
Other Collateralized Loans
Commercial Mortgage and Other Loans [Line Items]
Other loans	192	65
Other loans
Commercial Mortgage and Other Loans [Line Items]
Total net loans	960	841
Allowance for credit losses, Other loans	(7)	(4)
Office
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 12,908	$ 13,462
% of Total	20.60%	21.40%
Retail
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 7,967	$ 8,379
% of Total	12.70%	13.30%
Apartments/Multi-Family
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 18,171	$ 17,348
% of Total	28.90%	27.60%
Industrial
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 13,217	$ 13,226
% of Total	21.00%	21.10%
Hospitality
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 2,401	$ 2,415
% of Total	3.80%	3.90%
Other
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 4,503	$ 4,533
% of Total	7.20%	7.20%
Agricultural property loans
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 3,665	$ 3,472
% of Total	5.80%	5.50%

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Commercial mortgage loans, Percentage

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