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Derivatives - Offsetting Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Offsetting of Financial Liabilities under Master Netting Agreements with Derivative Counterparties    
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet $ 182 $ 95
Net Amount of Derivative Liabilities 148 56
Derivatives Subject to Master Netting Agreements    
Offsetting of Financial Liabilities under Master Netting Agreements with Derivative Counterparties    
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet 182 93
Gross Amount of Eligible Offsetting Recognized Derivative Assets 34 39
Net Amount of Derivative Liabilities $ 148 54
Derivatives Not Subject to Master Netting Agreements    
Offsetting of Financial Liabilities under Master Netting Agreements with Derivative Counterparties    
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet   2
Net Amount of Derivative Liabilities   $ 2