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Legal Proceedings and Guarantees - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]      
Adverse premium development recognized as result of rating errors $ 1 $ 37  
Guarantee Obligations      
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]      
Guarantor obligations, maximum exposure, undiscounted 1,800 1,800  
Indemnification Agreement      
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]      
Guarantor obligations, maximum exposure, undiscounted 254 254  
Guarantee agreement      
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]      
Guarantor obligations, maximum exposure, undiscounted 434 434  
Guarantee and Indemnification      
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]      
Guarantor obligations, current carrying value 5 5 $ 5
Insurance Premium Rate Adjustment      
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]      
Interest due to policyholders 1 6  
Multi-Peril Package Product | Insurance Premium Rate Adjustment      
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]      
Loss contingency accrual $ 96 $ 96