Derivative Instruments and Hedging Activities - Part 2 (Details) - USD ($) $ in Millions		Jun. 30, 2016	Dec. 31, 2015
Assets
Derivative Assets, Gross		$ 384	$ 375
Liabilities
Derivative Liabilities, Gross		688	490
Derivative, net liability position, present value subject to collateralization	[1]	68	58
Collateral Already Posted, Aggregate Fair Value	[1]	34	38
Other Current Assets [Member]
Assets
Derivative Assets, Gross		104	86
Other Current Liabilities [Member]
Liabilities
Derivative Liabilities, Gross		172	144
Other Noncurrent Assets [Member]
Assets
Derivative Assets, Gross		280	289
Other Noncurrent Liabilities [Member]
Liabilities
Derivative Liabilities, Gross		516	346
Designated as Hedging Instruments [Member]
Assets
Derivative Assets, Gross		38	38
Liabilities
Derivative Liabilities, Gross		625	448
Not Designated as Hedging Instruments [Member]
Assets
Derivative Assets, Gross		346	337
Liabilities
Derivative Liabilities, Gross		63	42
Interest Rate Contract [Member]
Liabilities
Derivative Liabilities, Gross		525	358
Interest Rate Contract [Member] | Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross		524	358
Interest Rate Contract [Member] | Not Designated as Hedging Instruments [Member]
Liabilities
Derivative Liabilities, Gross		1	0
Cross currency derivatives [Member]
Assets
Derivative Assets, Gross		1	0
Liabilities
Derivative Liabilities, Gross		39	43
Cross currency derivatives [Member] | Designated as Hedging Instruments [Member]
Assets
Derivative Assets, Gross		1	0
Liabilities
Derivative Liabilities, Gross		39	43
Cross currency derivatives [Member] | Not Designated as Hedging Instruments [Member]
Assets
Derivative Assets, Gross		0	0
Liabilities
Derivative Liabilities, Gross		0	0
Foreign Exchange Contract [Member]
Assets
Derivative Assets, Gross		317	327
Liabilities
Derivative Liabilities, Gross		66	56
Foreign Exchange Contract [Member] | Designated as Hedging Instruments [Member]
Assets
Derivative Assets, Gross		10	8
Liabilities
Derivative Liabilities, Gross		36	35
Foreign Exchange Contract [Member] | Not Designated as Hedging Instruments [Member]
Assets
Derivative Assets, Gross		307	319
Liabilities
Derivative Liabilities, Gross		30	21
Commodity Contract [Member]
Assets
Derivative Assets, Gross		66	48
Liabilities
Derivative Liabilities, Gross		58	33
Commodity Contract [Member] | Designated as Hedging Instruments [Member]
Assets
Derivative Assets, Gross		27	30
Liabilities
Derivative Liabilities, Gross		26	12
Commodity Contract [Member] | Not Designated as Hedging Instruments [Member]
Assets
Derivative Assets, Gross		39	18
Liabilities
Derivative Liabilities, Gross		$ 32	$ 21

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