Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative [Line Items]
Unrealized gain (loss) on hedges of net investments	$ 65	$ (174)	$ 351	$ (545)
Gain on amounts excluded from effectiveness testing	61	68	117	135
Derivative Contract [Member]
Derivative [Line Items]
Notional amount	28,100		28,100
Derivative instruments, gains to be reclassified to earnings	(10)		$ (10)
Derivative Contract [Member] \| Maximum [Member]
Derivative [Line Items]
Maximum length of time hedged in a cash flow hedge			18 months
Derivative Contract [Member] \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount	11,100		$ 11,100
Gain on derivatives not designated as hedging instruments	(54)	239	(61)	334
Derivative Contract [Member] \| Cash Flow Hedging [Member]
Derivative [Line Items]
Notional amount	5,700		5,700
Derivative Contract [Member] \| Net Investment Hedging [Member]
Derivative [Line Items]
Notional amount	11,300		11,300
Unrealized gain (loss) on hedges of net investments	$ (118)	$ 1,060	$ 173	$ 303