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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2020
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit)
The following schedule discloses significant components of income tax expense (benefit) for each year presented: 
Year Ended December 31,
202020192018
  (in thousands) 
Current tax expense (benefit):
U.S. federal$91,707 $14,381 $(422,999)
Total91,707 14,381 (422,999)
Deferred tax expense (benefit):
U.S. federal(957,427)(305,482)584,503 
Total(957,427)(305,482)584,503 
Income tax expense (benefit)(865,720)(291,101)161,504 
Income tax expense (benefit) reported in equity related to:
Other comprehensive income (loss)293,588 200,447 (52,510)
Total income tax expense (benefit)$(572,132)$(90,654)$108,994 
Schedule of Income Before Income Tax, Domestic and Foreign
The differences between income taxes expected at the U.S. federal statutory income tax rate of 21% applicable for 2020, 2019 and 2018, and the reported income tax expense (benefit) are summarized as follows:
Year Ended December 31,
202020192018
 (in thousands)
Expected federal income tax expense (benefit)$(847,347)$(268,890)$387,286 
Non-taxable investment income(10,942)(12,019)(18,954)
Tax credits(7,908)(11,708)(13,694)
Changes in tax law(193,306)
Other477 1,516 172 
Reported income tax expense (benefit)$(865,720)$(291,101)$161,504 
Effective tax rate21.5 %22.7 %8.8 %
Schedule of Deferred Tax Assets and Liabilities
Schedule of Deferred Tax Assets and Deferred Tax Liabilities
As of December 31,
20202019
 (in thousands)
Deferred tax assets:
Insurance reserves$2,648,343 $1,716,039 
Investments425,467 411,788 
Other539 2,002 
Deferred tax assets3,074,349 2,129,829 
Deferred tax liabilities:
VOBA and deferred policy acquisition cost879,072 929,882 
Deferred sales inducements150,065 170,672 
Net unrealized gain on securities506,543 154,815 
Deferred tax liabilities1,535,680 1,255,369 
Net deferred tax asset (liability)$1,538,669 $874,460