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Income Taxes - Effective Income Tax Rate (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Reconciliation between the U.S. corporate income tax rate and the effective income tax rate from continuing operations        
U.S. corporate income tax rate (as a percent) 21.00% 21.00% 21.00% 21.00%
Dividends received deduction (as a percent) (4.00%) (7.00%) (4.00%) (5.00%)
Tax credits (as a percent) (3.00%) (5.00%) (2.00%) (3.00%)
Interest exclusion from taxable income (as a percent) (1.00%) (1.00%) (1.00%) (1.00%)
Foreign tax rate differential (as a percent) (1.00%) 1.00%    
Impact of equity method presentation (as a percent)   (2.00%) (1.00%) (1.00%)
State income taxes (as a percent) 1.00% 2.00% 1.00% 1.00%
Low income housing tax credit amortization 1.00% 1.00% 1.00% 1.00%
Other income tax rate impacts (as a percent) 1.00% 4.00%   2.00%
Effective income tax rate (as a percent) 15.00% 14.00% 15.00% 15.00%