Investments - Securities loaned and Other (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Securities loaned
Fixed income and equity securities loaned	$ 1,740	$ 1,400
Interest Income on collateral, net of fees	5	4	$ 7
Other investment information
Short-term Investments	4,260
Other	4,005	3,852
Below investment grade assets	7,150	5,230
Fixed income securities and short-term investments deposited with regulatory authorities	147
Non-income producing fixed income securities and other investments	40
Bank loans
Other investment information
Other	1,204	1,350
Real estate
Other investment information
Other	1,005	791
Policy loans
Other investment information
Other	894	891
Agent loans
Other investment information
Other	666	620
Derivatives and other
Other investment information
Other	$ 236	$ 200
California
Municipal Bonds
Percentage of municipal bonds carrying value	12.70%	12.30%
Texas
Municipal Bonds
Percentage of municipal bonds carrying value	8.60%	7.40%
Colorado
Municipal Bonds
Percentage of municipal bonds carrying value	5.80%	4.00%
Washington
Municipal Bonds
Percentage of municipal bonds carrying value	5.50%	6.20%
New Jersey
Municipal Bonds
Percentage of municipal bonds carrying value	3.70%	5.60%
Stockholders' Equity, Total | Credit Concentration Risk | Minimum
Municipal Bonds
Percentage of credit concentration risk of single issuer and affiliates of shareholder's equity	10.00%