Financial Instruments Derivatives Designated as Hedging, Gain (Loss) Tables (Details) (Designated as Hedging Instrument [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Gain Recognized in OCI on Derivatives (Effective Portion)	$ 1	$ (32)	$ (41)
Amount of (Loss) Gain Reclassified from AOCI into Income (Effective Portion)	(47)	(34)	(28)
Amount of Loss Recognized in Income on Derivatives (Ineffective Portion)	0	(1)	0
Interest rate swap contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Gain Recognized in OCI on Derivatives (Effective Portion)	(4)	(13)	(58)
Amount of Loss Recognized in Income on Derivatives (Ineffective Portion)	0	0	0
Interest rate swap contracts | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Gain Reclassified from AOCI into Income (Effective Portion)	(38)	(39)	(38)
Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Gain Recognized in OCI on Derivatives (Effective Portion)	7	(22)	16
Amount of Loss Recognized in Income on Derivatives (Ineffective Portion)	0		0
Commodity contracts | Cost of goods sold
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Gain Reclassified from AOCI into Income (Effective Portion)	(10)	5	9
Commodity contracts | Other income, net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in Income on Derivatives (Ineffective Portion)		(1)
Foreign currency contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Gain Recognized in OCI on Derivatives (Effective Portion)	(2)	3	1
Amount of Loss Recognized in Income on Derivatives (Ineffective Portion)	0	0	0
Foreign currency contracts [Member] | Cost of goods sold
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Gain Reclassified from AOCI into Income (Effective Portion)	$ 1	$ 0	$ 1