Fair Value Measurements, Derivative Instruments, Gains & Losses (Details) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	$ (38)	$ 0	$ 0
Cross Currency Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount Of Derivatives		1,500			$ 900
Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount Of Derivatives		3,100			1,000
Payments for Hedge, Financing Activities	17
Currency Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount Of Derivatives		3,424			2,846
Currency Exchange Contracts [Member] | Other Expense [Member] | Derivatives Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative, Net	52	37
Currency Exchange Contracts [Member] | Cost of Sales [Member] | Derivatives Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative, Net	1	2
Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Other Expense [Member] | Derivatives Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Hedged Debt in Fair Value Hedge	(93)	7
Gain (Loss) on Derivative, Net	97	(5)
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	(50)	0
Notional Amount Of Derivatives				€ 1,800	$ 900
Payments for Hedge, Financing Activities	50
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Other Expense [Member] | Derivatives Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(25)	(12)
Net Investment Hedging [Member] | Cross Currency Interest Rate Contract [Member] | Derivatives Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) in Currency Translation Adjustment on Net Investment Hedge	49	28
Net Investment Hedging [Member] | Cross Currency Interest Rate Contract [Member] | Other Expense [Member] | Derivatives Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative, Net	48	21
Net Investment Hedging [Member] | Foreign currency-denominated debt [Member] | Derivatives Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) in Currency Translation Adjustment on Net Investment Hedge	$ 60	$ 336