Derivative Instruments and Hedging Activities - Part 2 (Details) - USD ($) $ in Millions		Mar. 31, 2017	Dec. 31, 2016
Liabilities
Derivative Liabilities, Gross		$ 387	$ 424
Derivative, Net Liability Position, Aggregate Fair Value	[1]	26	41
Collateral Already Posted, Aggregate Fair Value	[1]	7	18
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		348	376
Other Current Assets [Member]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		93	99
Other Current Liabilities [Member]
Liabilities
Derivative Liabilities, Gross		105	155
Other Noncurrent Assets [Member]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		255	277
Other Noncurrent Liabilities [Member]
Liabilities
Derivative Liabilities, Gross		282	269
Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross		345	358
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		51	51
Not Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross		42	66
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		297	325
Interest Rate Contract [Member]
Liabilities
Derivative Liabilities, Gross		301	300
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		18	18
Interest Rate Contract [Member] | Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross		296	295
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		18	18
Interest Rate Contract [Member] | Not Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross		5	5
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		0	0
Cross currency derivatives [Member]
Liabilities
Derivative Liabilities, Gross		10	18
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		10	4
Cross currency derivatives [Member] | Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross		10	18
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		10	4
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		48	64
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		278	309
Foreign Exchange Contract [Member] | Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross		27	19
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		8	9
Foreign Exchange Contract [Member] | Not Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross		21	45
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		270	300
Commodity Contract [Member]
Liabilities
Derivative Liabilities, Gross		28	42
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		42	45
Commodity Contract [Member] | Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross		12	26
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		15	20
Commodity Contract [Member] | Not Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross		16	16
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		$ 27	$ 25

[1] (1) Based on the credit rating of certain subsidiaries