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Commitments and Contingencies - Additional Information (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2016
plaintiff
Feb. 28, 2011
plaintiff
Dec. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Loss Contingencies [Line Items]            
Rental expense on operating leases       $ 57,000,000 $ 53,000,000 $ 60,000,000
Sublease rental income       3,000,000 2,000,000 $ 3,000,000
Outstanding commitments     $ 989,000,000 989,000,000    
Commitments to fund limited partnerships     829,000,000 829,000,000    
Commitments to fund obligations associated with private placement securities     54,000,000 54,000,000    
Commitments related to mortgage loans     106,000,000 106,000,000    
Minimum percentage of written premiums in state for assessment under guaranty funds       0.01    
Maximum percentage of written premiums in state for assessment under guaranty funds       0.02    
Guaranty liabilities     113,000,000 113,000,000 126,000,000  
Fair value of derivative instrument in a net liability position     534,000,000 534,000,000    
Collateral already posted     609,000,000 609,000,000    
Additional collateral required     10,000,000 10,000,000    
Other Assets            
Loss Contingencies [Line Items]            
Premium tax offsets     6,000,000 6,000,000 19,000,000  
Asbestos and Environmental            
Loss Contingencies [Line Items]            
Reinsurance premium         650,000,000  
Maximum adverse loss development to be ceded under agreement         1,500,000,000.0  
Asbestos            
Loss Contingencies [Line Items]            
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts     1,200,000,000 1,200,000,000    
Environmental            
Loss Contingencies [Line Items]            
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts     237,000,000 237,000,000    
Asbestos and Environmental            
Loss Contingencies [Line Items]            
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts     1,452,000,000 1,452,000,000 1,700,000,000  
Reinsurance premium         650,000,000  
Maximum adverse loss development to be ceded under agreement         $ 1,500,000,000.0  
Adverse development from comprehensive annual review     $ 285,000,000 $ 285,000,000    
Pending Litigation | Mutual Funds Litigation            
Loss Contingencies [Line Items]            
Number of funds on which action has been brought | plaintiff 6 6        
Settled Litigation | Mutual Funds Litigation            
Loss Contingencies [Line Items]            
Number of funds on which action has been brought | plaintiff 1