Investments (Commercial Mortgage and Other Loans) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2021	Dec. 31, 2020
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 63,800	$ 64,784
Other loans	731	876
Total commercial mortgage and other loans	$ 64,359	$ 65,425
% of Total	100.00%	100.00%
Net carrying value of commercial loans held for sale	$ 304	$ 1,092
Commercial Mortgage Loans
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 59,638	$ 60,736
% of Total	93.50%	93.80%
Commercial mortgage and agricultural property loans
Commercial Mortgage and Other Loans [Line Items]
Allowance for credit losses	$ (166)	$ (227)
Total net loans	63,634	64,557
Uncollateralized loans
Commercial Mortgage and Other Loans [Line Items]
Other loans	579	655
Residential property loans
Commercial Mortgage and Other Loans [Line Items]
Other loans	81	101
Other Collateralized Loans
Commercial Mortgage and Other Loans [Line Items]
Other loans	71	120
Other loans
Commercial Mortgage and Other Loans [Line Items]
Total net loans	725	868
Allowance for credit losses, Other loans	(6)	(8)
Office
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 12,347	$ 12,750
% of Total	19.40%	19.70%
Retail
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 7,160	$ 7,326
% of Total	11.20%	11.30%
Apartments/Multi-Family
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 17,434	$ 18,330
% of Total	27.30%	28.30%
Industrial
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 15,390	$ 14,954
% of Total	24.10%	23.10%
Hospitality
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 2,356	$ 2,395
% of Total	3.70%	3.70%
Other
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 4,951	$ 4,981
% of Total	7.80%	7.70%
Agricultural property loans
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 4,162	$ 4,048
% of Total	6.50%	6.20%

Carrying value of loans held for sale

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Commercial mortgage loans, Percentage

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