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Derivatives and Hedging Activities (Narrative) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Document Period End Date Jun. 30, 2019
Derivative, Net Liability Position, Aggregate Fair Value $ 8
Collateral already posted, aggregate fair value 0
Additional Collateral, Aggregate Fair Value $ 3