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Derivatives - Offsetting Assets (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Counterparty
Dec. 31, 2018
USD ($)
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 $ 142 $ 146
Net Amount of Derivative Assets 128 108
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 142 146
Gross Amount of Eligible Offsetting Recognized Derivative Liabilities 14 38
Net Amount of Derivative Assets $ 128 $ 108