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Derivative Instruments and Hedging Activity - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Interest Rate Swap [Member]
Derivative [Line Items]
Notional amount		$ 6,839		$ 7,056
Interest Rate Contract [Member]
Derivative [Line Items]
Gains (losses) reclassified from AOCI to interest expense		6
Foreign Currency Contract [Member] \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gains related to foreign currency contract	$ 1		$ 13
Credit Risk Related Contingent Contracts [Member]
Derivative [Line Items]
Liabilities		$ 640		$ 108