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Variable Interest Entities - Summary of Assets and Liabilities Related to Consolidated Variable Interest Entities (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Variable interest entities [Member]    
Variable Interest Entity [Line Items]    
Consolidated Assets $ 248 $ 320
Consolidated Liabilities 134 160
Other assets [Member] | Low income housing limited partnership investments [Member]    
Variable Interest Entity [Line Items]    
Consolidated Assets 248 320
Long-term debt [Member] | Low income housing limited partnership investments [Member]    
Variable Interest Entity [Line Items]    
Consolidated Liabilities 79 92
Interest, taxes and other liabilities [Member] | Low income housing limited partnership investments [Member]    
Variable Interest Entity [Line Items]    
Consolidated Liabilities $ 55 $ 68