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Legal Proceedings, Contingencies and Guarantees (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Guarantee Obligations          
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]          
Guarantor obligations, maximum exposure, undiscounted $ 1,800   $ 1,800    
Guarantee and Indemnification Agreements          
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]          
Guarantor obligations, current carrying calue 5   5   $ 5
Guarantee Agreement          
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]          
Guarantor obligations, maximum exposure, undiscounted 375   375    
Indemnification Agreement          
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]          
Guarantor obligations, maximum exposure, undiscounted 252   252    
Earned Premiums | Insurance Premium Rate Adjustment | Multi-Peril Package Product          
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]          
Earned premium adjustment $ 6   6 $ (37)  
Interest Expense | Insurance Premium Rate Adjustment | Multi-Peril Package Product          
Legal Proceedings, Commitments and Contingencies, and Guarantees [Line Items]          
Premium rate adjustment   $ 1 $ 1 $ 7