Other Assets (Derivative Instruments Narrative) (Details )	3 Months Ended	9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)
Derivative [Line Items]
Derivative, terminated amount	$ 4,100,000,000	$ 4,100,000,000
Loss on discontinuation of cash flow hedge due to forecasted transaction probable of not occurring	$ 7,200,000
Swap | Hedging
Derivative [Line Items]
Reclassification of hedge gain (loss) from AOCI		(49,900,000)
Loss on derivative		$ 0