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Basis of Presentation and Significant Accounting Policies Impact of Accounting Changes (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing Receivable, before Allowance for Credit Loss       $ 4,215  
Mortgage loans (net of ACL of $29 and $38)       0  
Financing Receivable, after Allowance for Credit Loss       4,215  
Premiums Receivable, Gross $ 4,550 $ 4,420   4,529  
Premium Receivable, Allowance for Credit Loss (105) (152)   (145)  
Premiums Receivable, Net 4,445 4,268   4,384  
Reinsurance Recoverables, Gross 6,622 6,119   5,641  
Allowance for uncollectible reinsurance (45) (55)   (48)  
Reinsurance recoverables, net 6,523 6,011   5,527  
Deferred income taxes 270 46   299  
Other Liabilities (5,655) (5,222)   (5,157)  
Retained Earnings (Accumulated Deficit) 15,764 13,918   12,685  
Commercial Loan [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing Receivable, before Allowance for Credit Loss 5,412 4,531      
Mortgage loans (net of ACL of $29 and $38) (29) (38)   0 $ (1)
Financing Receivable, after Allowance for Credit Loss 5,383 4,493      
Uncollectible reinsurance          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Allowance for uncollectible reinsurance $ (99) $ (108)   (114)  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest       (2)  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Commercial Loan [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Retained Earnings (Accumulated Deficit)     $ 19    
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing Receivable, before Allowance for Credit Loss     4,215    
Mortgage loans (net of ACL of $29 and $38)     (19)    
Financing Receivable, after Allowance for Credit Loss     4,196    
Premiums Receivable, Gross     4,529    
Premium Receivable, Allowance for Credit Loss     (122) (122)  
Premiums Receivable, Net     4,407    
Reinsurance Recoverables, Gross     5,641    
Allowance for uncollectible reinsurance       $ (50)  
Reinsurance recoverables, net     5,525    
Deferred income taxes     304    
Other Liabilities     (5,182)    
Retained Earnings (Accumulated Deficit)     12,667    
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commercial Loan [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Mortgage loans (net of ACL of $29 and $38)     (19)    
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Uncollectible reinsurance          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Allowance for uncollectible reinsurance     (116)    
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     18    
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Reinsurance Recoverable Including Reinsurance Premium Paid [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     (2)    
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Deferred Income Tax Asset, Net [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     (5)    
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Other liabilities          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     (25)    
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Total Change to LCL and ACL [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     23    
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Premiums Receivable [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     (23)    
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Commercial Loan [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     $ (19)