Derivative Instruments and Hedging Activities - Part 2 (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Liabilities
Derivative Liabilities, Gross	$ 458	$ 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	53	75
Other Current Liabilities [Member]
Derivatives Fair Value Table [Line Items]
Derivative Liability, Current	80	51
Other Noncurrent Assets [Member]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Asset, Noncurrent	199	187
Other Noncurrent Liabilities [Member]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Liability, Noncurrent	378	206
Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross	409	238
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross	11	35
Not Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross	49	19
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross	241	227
Interest Rate Contract [Member]
Liabilities
Derivative Liabilities, Gross	402	208
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross	0	29
Interest Rate Contract [Member] \| Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross	393	205
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross	0	29
Interest Rate Contract [Member] \| Not Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross	9	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	11	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	11	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	29	41
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross	213	217
Foreign Exchange Contract [Member] \| Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross	11	28
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross	0	0
Foreign Exchange Contract [Member] \| Not Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross	18	13
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross	213	217
Commodity Contract [Member]
Liabilities
Derivative Liabilities, Gross	24	3
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross	28	10
Commodity Contract [Member] \| Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross	2	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	22	3
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross	$ 28	$ 10

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