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Legal Proceedings and Guarantees - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]    
Reduction to earned premium due to the small business premium rate adjustment contingency $ 42 $ 16
Guarantee Obligations    
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]    
Guarantor obligations, maximum exposure, undiscounted 1,800  
Indemnification Agreement    
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]    
Guarantor obligations, maximum exposure, undiscounted 254  
Guarantee agreement    
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]    
Guarantor obligations, maximum exposure, undiscounted 434  
Guarantee and Indemnification    
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]    
Guarantor obligations, current carrying value 5 $ 5
Insurance Premium Rate Adjustment    
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]    
Interest due to policyholders 5  
Multi-Peril Package Product | Insurance Premium Rate Adjustment    
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]    
Loss contingency accrual 36  
Accident and Health Insurance Product Line | Insurance Premium Rate Adjustment    
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]    
Loss contingency accrual $ 50