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Value of Business Acquired
 12 Months Ended
Dec. 31, 2020
Present Value of Future Insurance Profits [Abstract]  
Value of Business Acquired VALUE OF BUSINESS ACQUIRED
 
The balances of and changes in VOBA as of and for the years ended December 31, are as follows:
 
202020192018
 (in millions)
Balance, beginning of period$1,110 $1,850 $1,591 
Amortization—Impact of assumption and experience unlocking and true-ups(317)(139)0 
Amortization—All other(212)(235)(276)
Change due to unrealized investment gains and losses418 (478)455 
Interest56 64 69 
Foreign currency translation48 10 23 
Other0 38 (12)
Balance, end of period$1,103 $1,110 $1,850 
The following table provides VOBA balances for the year ended December 31, 2020:
VOBA
Balance
(in millions)
CIGNA$219 
Prudential Annuities Holding Co.$29 
Gibraltar Life$852 
Gibraltar BSN Life Berhad$3 

The following table provides estimated future amortization, net of interest, for the periods indicated:
 
20212022202320242025
 (in millions)
Estimated future VOBA amortization$99 $93 $85 $79 $72