Derivative Instruments and Hedging Activities - Part 2 (Details) - USD ($) $ in Millions		Sep. 30, 2017	Dec. 31, 2016
Liabilities
Derivative Liabilities, Gross		$ 361	$ 424
Derivative, Net Liability Position, Aggregate Fair Value	[1]	12	41
Collateral Already Posted, Aggregate Fair Value	[1]	5	18
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		358	376
Other Current Assets [Member]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		101	99
Other Current Liabilities [Member]
Liabilities
Derivative Liabilities, Gross		221	155
Other Noncurrent Assets [Member]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		257	277
Other Noncurrent Liabilities [Member]
Liabilities
Derivative Liabilities, Gross		140	269
Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross		168	358
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		39	51
Not Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross		193	66
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		319	325
Interest Rate Contract [Member]
Liabilities
Derivative Liabilities, Gross		296	300
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		13	18
Interest Rate Contract [Member] | Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross		151	295
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		13	18
Interest Rate Contract [Member] | Not Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross		145	5
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		0	0
Cross currency derivatives [Member]
Liabilities
Derivative Liabilities, Gross		5	18
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		14	4
Cross currency derivatives [Member] | Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross		5	18
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		14	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		42	64
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		279	309
Foreign Exchange Contract [Member] | Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross		7	19
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		5	9
Foreign Exchange Contract [Member] | Not Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross		35	45
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		274	300
Commodity Contract [Member]
Liabilities
Derivative Liabilities, Gross		18	42
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		52	45
Commodity Contract [Member] | Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross		5	26
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		7	20
Commodity Contract [Member] | Not Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross		13	16
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross		$ 45	$ 25

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