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Derivatives - Offsetting Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Offsetting of Financial Liabilities under Master Netting Agreements with Derivative Counterparties    
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet $ 32 $ 20
Net Amount of Derivative Liabilities 19 6
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 32 20
Gross Amount of Eligible Offsetting Recognized Derivative Assets 13 14
Net Amount of Derivative Liabilities $ 19 $ 6