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Derivatives - Offsetting Assets (Details)
$ in Millions
9 Months Ended
Sep. 30, 2017
USD ($)
Counterparty
Dec. 31, 2016
USD ($)
Offsetting of Financial Assets under Master Netting Agreements with Derivative Counterparties    
Number of master netting agreements supported by primary counterparty's parent guarantee | Counterparty 17  
Number of credit support agreements by primary counterparty | Counterparty 16  
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet $ 77 $ 259
Net Amounts of Derivative Assets 43 220
Derivatives Subject to Master Netting Agreements    
Offsetting of Financial Assets under Master Netting Agreements with Derivative Counterparties    
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet 77 259
Gross Amount of Eligible Offsetting Recognized Derivative Liabilities 34 39
Net Amounts of Derivative Assets $ 43 $ 220