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

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Entity discloses that the amount of fair value hedge ineffectiveness is immaterial.

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Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

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Objectives and Strategies for Using Derivatives (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended			36 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018
Foreign Exchange Contract \| Not Designated as Hedging Instrument
Aggregate notional value	$ 1,500			$ 1,500
Gains (Losses) on undesignated foreign exchange hedging instruments	(52)	$ 37	$ (30)
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2
Derivative Assets	30	27		30
Derivative Liability	18	$ 51		18
Net Investment Hedging \| Foreign Exchange Contract
Aggregate notional value	573			$ 573
Fair Value Hedging
Fair value hedge ineffectiveness is immaterial assertion				Fair value hedges resulted in no significant ineffectiveness in each of the three years ended December 31, 2018
Gains or losses from hedged firm commitment not qualifying as fair value hedge				$ 0
Fair Value Hedging \| Interest Rate Contract
Aggregate notional value	$ 300			$ 300
Cash Flow Hedging
Cash flow hedge ineffectiveness is immaterial assertion				Cash flow hedges resulted in no significant ineffectiveness in each of the three years ended December 31, 2018
Gains or losses reclassified into earnings resulting from discontinuance of cash flow hedges				$ 0
Maximum maturity of cash flow hedges	Dec. 31, 2020
Cash Flow Hedging \| Interest Rate Contract
Aggregate notional value	$ 100			100
Cash Flow Hedging \| Foreign Exchange Contract
Aggregate notional value	$ 620			$ 620