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Legal Proceedings, Contingencies and Guarantees (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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 252    
Guarantee agreement      
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]      
Guarantor obligations, maximum exposure, undiscounted 375    
Guarantee and Indemnification      
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]      
Guarantor obligations, current carrying calue 5 $ 5  
Earned Premiums, Net | Insurance Premium Rate Adjustment | Multi-Peril Package Product      
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]      
Loss contingency accrual, period increase (decrease) 6 (36) $ (16)
Interest Expense | Insurance Premium Rate Adjustment | Multi-Peril Package Product      
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]      
Loss contingency accrual, provision $ 1 $ 7