Derivative Instruments and Hedging Activities (Derivative Instruments Used in Net Investment Hedge Accounting Relationships) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest rate contracts | Cash flow hedging
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) gain recognized in other comprehensive income, cash flow hedge, interest rate contracts	$ (12,000,000)	$ (21,000,000)	$ (55,000,000)	$ 129,000,000
Foreign exchange contracts | Net investment hedging
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) gain recognized in other comprehensive income, net investment hedge, foreign exchange contracts	4,000,000	(4,000,000)	(1,000,000)	3,000,000
Amounts excluded from effectiveness testing	0	0	0	0
Amounts reclassified from accumulated other comprehensive income	$ 0	$ 0	$ 0	$ 0