Derivative Instruments and Hedging Activities - Part 2 (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Liabilities
Derivative Liabilities, Gross	$ 307	$ 257
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross	252	262
Other Current Assets [Member]
Derivatives Fair Value Table [Line Items]
Derivative Asset, Current	56	75
Other Current Liabilities [Member]
Derivatives Fair Value Table [Line Items]
Derivative Liability, Current	44	51
Other Noncurrent Assets [Member]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Asset, Noncurrent	196	187
Other Noncurrent Liabilities [Member]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Liability, Noncurrent	263	206
Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross	278	238
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross	23	35
Not Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross	29	19
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross	229	227
Interest Rate Contract [Member]
Liabilities
Derivative Liabilities, Gross	269	208
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross	12	29
Interest Rate Contract [Member] \| Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross	262	205
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross	12	29
Interest Rate Contract [Member] \| Not Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross	7	3
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross	0	0
Cross currency derivatives [Member]
Liabilities
Derivative Liabilities, Gross	3	5
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross	10	6
Cross currency derivatives [Member] \| Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross	3	5
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross	10	6
Cross currency derivatives [Member] \| Not Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross	0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross	0	0
Foreign Exchange Contract [Member]
Liabilities
Derivative Liabilities, Gross	28	41
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross	217	217
Foreign Exchange Contract [Member] \| Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross	13	28
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross	1	0
Foreign Exchange Contract [Member] \| Not Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross	15	13
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross	216	217
Commodity Contract [Member]
Liabilities
Derivative Liabilities, Gross	7	3
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross	13	10
Commodity Contract [Member] \| Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross	0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross	0	0
Commodity Contract [Member] \| Not Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross	7	3
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross	$ 13	$ 10

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