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Income Taxes - Reconciliation of income taxes at the statutory rate to the provision for income taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Earnings before income taxes (“EBT”) $ 1,108 $ 639 $ 724
Income taxes at statutory rate 233 134 253
Effect of tax exempt interest (14) (13) (23)
Effect of stock-based compensation (8) (8) (16)
Effect of dividends received deduction (4) (4) (8)
Effect of adjustments to prior year taxes (3) (8) (4)
Effect of employee stock ownership plan dividend paid deduction (2) (3) (5)
Effect of change in valuation allowance (excluding change in tax rate) 17 11 (7)
Effect of nondeductible expenses 8 7 6
Effect of foreign operations 4 (2) 21
Effect of Neon restructuring 0 0 (56)
Effective of change in U.S. corporate tax rate 0 0 83
Effect of other income tax reconciliation 8 8 3
Provision for income taxes as shown in the Statement of Earnings $ 239 $ 122 $ 247
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Income taxes at statutory rate as a percentage of EBT 21.00% 21.00% 35.00%
Effect of tax exempt interest as a percentage of EBT (1.00%) (2.00%) (3.00%)
Effect of stock-based compensation as a percentage of EBT (1.00%) (1.00%) (2.00%)
Effect of dividend received deduction as a percentage of EBT 0.00% (1.00%) (1.00%)
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent 0.00% (1.00%) (1.00%)
Effect of employee stock ownership plan dividend paid deduction as a percentage of EBT 0.00% (1.00%) (1.00%)
Effect of change in valuation allowance (excluding change in tax rate) as a percentage of EBT 2.00% 2.00% (1.00%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent 1.00% 1.00% 1.00%
Effect of foreign operations as a percentage of EBT 0.00% 0.00% 3.00%
Effect of Neon restructuring as a percentage of EBT 0.00% 0.00% (8.00%)
Effective of change in U.S. corporate tax rate as a percentage of EBT 0 0 0.11
Effect of other income tax reconciliation as a percentage of EBT 0.00% 1.00% 1.00%
Provision for income taxes as shown in the Statement of Earnings as a percentage of EBT 22.00% 19.00% 34.00%