Derivative Instruments (Narrative) (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2020	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Document Period End Date		Sep. 30, 2020
Credit Risk Derivative Liabilities, at Fair Value		$ 12
Credit Derivative, Maximum Exposure, Undiscounted	[1],[2]	1,307	$ 1,306
Cumulative Foreign Currency Translation Gain Loss Recorded In Accumulated Other Comprehensive Income Loss For Terminated Net Investment In Foreign Operations Hedges		198	$ 168
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net		$ 6

[1] Assumes the value of the referenced credit obligations is zero.

[2] The rating agency designations are based on ratings from Standard and Poor’s (“S&P”).