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Certain Long-Duration Contracts With Guarantees (Tables)
 12 Months Ended
Dec. 31, 2020
Long-Duration Contracts, Assumptions Supporting Guarantee Obligations [Abstract]  
Schedule of Net Amount of Risk by Product and Guarantee As of December 31, 2020 and 2019, the Company had the following guarantees associated with these contracts, by product and guarantee type:
 December 31, 2020December 31, 2019
In the Event of
Death(1)		At Annuitization/
Accumulation(1)(2)		In the Event of
Death(1)		At Annuitization/
Accumulation(1)(2)
Annuity Contracts(in thousands)
Return of net deposits
Account value$122,530,558 N/A$120,240,930 N/A
Net amount at risk$203,506 N/A$229,080 N/A
Average attained age of contractholders69 yearsN/A68 yearsN/A
Minimum return or contract value
Account value$23,359,093 131,888,370 $23,563,604 $129,812,105 
Net amount at risk$2,020,533 3,702,796 $2,254,621 $3,989,437 
Average attained age of contractholders71 years70 years70 years69 years
Average period remaining until earliest expected annuitizationN/A0 yearsN/A0 years

(1)Amounts include assumed reinsurance business.
(2)Includes income and withdrawal benefits.
Schedule of Fair Value of Separate Accounts by Major Category of Investment
Account balances of variable annuity contracts with guarantees were invested in separate account investment options as follows:
December 31, 2020(1)December 31, 2019(1)
 (in thousands)
Equity funds$83,132,748 $82,506,787 
Bond funds55,850,849 53,763,563 
Money market funds2,417,037 2,877,135 
Total$141,400,634 $139,147,485 
(1)Amounts include assumed reinsurance business.
Schedule of Minimum Guaranteed Benefit Liabilities
The table below summarizes the changes in general account liabilities for guarantees. The liabilities for GMDB and guaranteed minimum income benefits (“GMIB”) are included in “Future policy benefits” and the related changes in the liabilities are included in “Policyholders’ benefits.” GMAB, GMWB and GMIWB are accounted for as embedded derivatives and are recorded at fair value within “Future policy benefits.” Changes in the fair value of these derivatives, including changes in the Company’s own risk of non-performance, along with any fees attributed or payments made relating to the derivative are recorded in “Realized investment gains (losses), net.” See Note 5 for additional information regarding the methodology used in determining the fair value of these embedded derivatives. The Company maintains a portfolio of derivative investments that serve as a partial hedge of the risks associated with these products, for which the changes in fair value are also recorded in “Realized investment gains (losses), net.” This portfolio of derivative investments does not qualify for hedge accounting treatment under U.S. GAAP.
GMDBGMAB/GMWB/
GMIWB		GMIBTotals
Variable Annuity(in thousands)
Balance at December 31, 2017$622,802 $8,151,902 $22,526 $8,797,230 
Incurred guarantee benefits(1)(2)103,596 180,572 2,679 286,847 
Paid guarantee benefits(2)(67,887)0 (2,915)(70,802)
Change in unrealized investment gains and losses(2)(20,108)0 (230)(20,338)
Balance at December 31, 2018638,403 8,332,474 22,060 8,992,937 
Incurred guarantee benefits(1)(2)68,142 3,490,524 3,539 3,562,205 
Paid guarantee benefits(2)(51,418)0 (3,477)(54,895)
Change in unrealized investment gains and losses(2)26,377 0 274 26,651 
Balance at December 31, 2019681,504 11,822,998 22,396 12,526,898 
Incurred guarantee benefits(1)(2)139,032 5,491,006 7,075 5,637,113 
Paid guarantee benefits(2)(68,693)0 (4,445)(73,138)
Change in unrealized investment gains and losses(2)36,612 0 374 36,986 
Balance at December 31, 2020$788,455 $17,314,004 $25,400 $18,127,859 

(1)Incurred guarantee benefits include the portion of assessments established as additions to reserves as well as changes in estimates affecting the reserves. Also includes changes in the fair value of features considered to be derivatives.
(2)Amounts include assumed reinsurance business.
Deferred Sales Inducements Changes in DSI, reported as “Interest credited to policyholders’ account balances”, are as follows: 
 Sales Inducements
 (in thousands)    
Balance at December 31, 2017$1,020,786 
Capitalization2,888 
Amortization - Impact of assumption and experience unlocking and true-ups(5,713)
Amortization - All other(149,236)
Change in unrealized investment gains and losses20,873 
Balance at December 31, 2018889,598 
Capitalization797 
Amortization - Impact of assumption and experience unlocking and true-ups100,222 
Amortization - All other(146,620)
Change in unrealized investment gains and losses(31,273)
Balance at December 31, 2019812,724 
Capitalization1,084 
Amortization - Impact of assumption and experience unlocking and true-ups103,057 
Amortization - All other(150,083)
Change in unrealized investment gains and losses(52,184)
Balance at December 31, 2020$714,598