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Commitments and Contingent Liabilities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Commitments and Contingent Liabilities [Line Items]    
Fair value of collateral supporting these assets $ 802 $ 806
Other assets:    
Premium tax offset for future undiscounted assessments 40 44
Premium tax offset currently available for paid assessments 2 3
Total 42 47
Other liabilities:    
Insolvency assessments 35 36
Commitments | Commercial Mortgage Loans    
Commitments and Contingent Liabilities [Line Items]    
Total outstanding mortgage loan commitments 2,300 2,357
Portion of commitment where prearrangement to sell to investor exists 1,102 882
Allowance for credit losses 1 0
Change in allowance for credit loss expense (reversal) 0 (2)
Commitments | Commercial Mortgage Loans | Held-for-sale    
Commitments and Contingent Liabilities [Line Items]    
Total outstanding mortgage loan commitments 21  
Expected to be funded from the GA and other operations outside the SA    
Commitments and Contingent Liabilities [Line Items]    
Commitments to Purchase Investment (excluding Commercial Mortgage Loans) 10,347 9,567
Expected to be funded from the GA and other operations outside the SA | Held-for-sale    
Commitments and Contingent Liabilities [Line Items]    
Commitments to Purchase Investment (excluding Commercial Mortgage Loans) 118  
Expected to be funded from separate accounts    
Commitments and Contingent Liabilities [Line Items]    
Commitments to Purchase Investment (excluding Commercial Mortgage Loans) 236 336
Indemnification | Securities Lending and Securities Repurchase Transactions    
Commitments and Contingent Liabilities [Line Items]    
Indemnification provided to certain clients for securities lending and securities repurchase transactions 6,499 7,108
Fair value of related collateral associated with above indemnifications 6,635 7,254
Accrued Liability associated with guarantee 0 0
Indemnification | Securities Repurchase Transactions    
Commitments and Contingent Liabilities [Line Items]    
Indemnification provided to certain clients for securities lending and securities repurchase transactions 30 34
Fair value of related collateral associated with above indemnifications 29 34
Indemnification | Serviced Mortgage Loans    
Commitments and Contingent Liabilities [Line Items]    
Maximum exposure under indemnification agreements for mortgage loans serviced by the Company 2,930 2,684
First-loss exposure portion of above 854 784
Accrued Liability associated with guarantee 41 41
Allowance for credit losses 20 20
Change in allowance for credit loss expense (reversal) 0 1
Guarantee of Asset Values    
Commitments and Contingent Liabilities [Line Items]    
Guaranteed value of third parties’ assets 81,984 86,264
Fair value of collateral supporting these assets 83,609 90,612
Asset associated with guarantee, carried at fair value 1 0
Other Guarantees    
Commitments and Contingent Liabilities [Line Items]    
Other guarantees where amount can be determined 47 52
Accrued Liability associated with guarantee $ 34 $ 0