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DAC AND POLICYHOLDER BONUS INTEREST CREDITS
 12 Months Ended
Dec. 31, 2022
Contract holder Bonus Interest Credits [Abstract]  
DAC AND POLICYHOLDER BONUS INTEREST CREDITS DAC AND POLICYHOLDER BONUS INTEREST CREDITS
Changes in the DAC asset for the years ended December 31, 2022, 2021 and 2020 were as follows:
 Year Ended December 31,
 202220212020
(in millions)
Balance, beginning of year$4,267 $3,816 $4,225 
Capitalization of commissions, sales and issue expenses702 724 564 
Amortization:
Impact of assumptions updates and model changes7 19 (866)
All other(473)(475)(467)
Total amortization(466)(456)(1,333)
Change in unrealized investment gains and losses1,354 183 360 
Balance, end of year$5,857 $4,267 $3,816 

The deferred asset for policyholder bonus interest credits is reported in other assets in the consolidated balance sheets and changes in the deferred asset for policyholder bonus Interest credits are reported in interest credited to policyholders’ account balances. For the years ended December 31, 2022, 2021 and 2020 changes were as follows:
 Year Ended December 31,
 202220212020
(in millions)
Balance, beginning of year$361 $405 $431 
Amortization charged to income(41)(44)(26)
Balance, end of year$320 $361 $405