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Summary of Federal Income Tax Expense Attributable to Income (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Summary of percentage computed by applying the U.S. federal income tax rate to (loss) income before federal income taxes and noncontrolling interests      
Income before federal income taxes and noncontrolling interests $ 1,448 $ 901 $ 904
Computed (expected tax expense) 304 315 316
Dividends received deduction (45) (128) (144)
Tax credits (54) (90) (81)
Impact of enacted tax law changes [1] (28) (530)  
Other, net 34 25 35
Total federal income tax expense (benefit) $ 211 $ (408) $ 126
Computed (expected tax expense) 21.00% 35.00% 35.00%
Dividends received deduction (3.00%) (14.00%) (16.00%)
Tax credits (4.00%) (10.00%) (9.00%)
Impact of enacted tax law changes [1] (2.00%) (59.00%)  
Other, net 3.00% 3.00% 4.00%
Total federal income tax expense (benefit) 15.00% (45.00%) 14.00%
[1] Includes the waived $11 million of government sequestration fees and $17 million of tax benefits related to the Tax Cuts and Jobs Act for the year ended December 31, 2018. Includes the remeasurement of deferred tax assets and liabilities of $(541) million and government sequestration fees of $11 million as a result of the Act for the year ended December 31, 2017.