Derivative Financial Instruments and Hedging Activities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Other current assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	$ 4	$ 14
Derivatives not designated as hedges
Derivative asset designated as hedging instrument	4	14
Other current assets	18	37
Other long-term assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	68	42
Derivatives not designated as hedges
Derivative asset designated as hedging instrument	68	42
Other current liabilities [Member]
Derivatives designated as hedges
Other current liabilities	18	5
Derivatives not designated as hedges
Other current liabilities	18	5
Other current liabilities	26	19
Foreign currency exchange contracts
Derivatives not designated as hedges
Notional amount	2,954	2,777
Period of derivatives not designated as hedges	12 months	12 months
Foreign currency exchange contracts | Other current assets [Member]
Derivatives not designated as hedges
Other current assets	18	20
Foreign currency exchange contracts | Other current liabilities [Member]
Derivatives not designated as hedges
Other current liabilities	14	19
Commodity contracts
Derivatives not designated as hedges
Notional amount	57	102
Period of derivatives not designated as hedges	12 months	12 months
Commodity contracts | Other current assets [Member]
Derivatives not designated as hedges
Other current assets	0	17
Commodity contracts | Other current liabilities [Member]
Derivatives not designated as hedges
Other current liabilities	12	0
Fair Value Hedging [Member] | Fixed-to-floating interest rate swaps
Derivatives designated as hedges
Notional amount	940	540
Period of derivatives designated as hedges	1 to 22 years	2 to 23 years
Derivatives not designated as hedges
Period of derivatives designated as hedges	1 to 22 years	2 to 23 years
Fair Value Hedging [Member] | Fixed-to-floating interest rate swaps | Other current assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	0	0
Derivatives not designated as hedges
Derivative asset designated as hedging instrument	0	0
Fair Value Hedging [Member] | Fixed-to-floating interest rate swaps | Other long-term assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	68	42
Derivatives not designated as hedges
Derivative asset designated as hedging instrument	68	42
Fair Value Hedging [Member] | Fixed-to-floating interest rate swaps | Other current liabilities [Member]
Derivatives designated as hedges
Other current liabilities	2	0
Derivatives not designated as hedges
Other current liabilities	2	0
Designated as Hedging Instrument [Member] | Interest Rate Contract Floating to Fixed Interest Rate Swap [Domain]
Derivatives designated as hedges
Notional amount	300
Period of derivatives designated as hedges	2 years
Derivatives not designated as hedges
Period of derivatives designated as hedges	2 years
Designated as Hedging Instrument [Member] | Interest Rate Contract Floating to Fixed Interest Rate Swap [Domain] | Other current assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	0
Derivatives not designated as hedges
Derivative asset designated as hedging instrument	0
Designated as Hedging Instrument [Member] | Interest Rate Contract Floating to Fixed Interest Rate Swap [Domain] | Other long-term assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	0
Derivatives not designated as hedges
Derivative asset designated as hedging instrument	0
Designated as Hedging Instrument [Member] | Interest Rate Contract Floating to Fixed Interest Rate Swap [Domain] | Other current liabilities [Member]
Derivatives designated as hedges
Other current liabilities	0
Derivatives not designated as hedges
Other current liabilities	0
Cash Flow Hedging [Member] | Foreign currency exchange contracts
Derivatives designated as hedges
Notional amount	308	227
Period of derivatives designated as hedges	12 to 36 months	12 to 36 months
Derivatives not designated as hedges
Period of derivatives designated as hedges	12 to 36 months	12 to 36 months
Cash Flow Hedging [Member] | Foreign currency exchange contracts | Other current assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	4	4
Derivatives not designated as hedges
Derivative asset designated as hedging instrument	4	4
Cash Flow Hedging [Member] | Foreign currency exchange contracts | Other long-term assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	0	0
Derivatives not designated as hedges
Derivative asset designated as hedging instrument	0	0
Cash Flow Hedging [Member] | Foreign currency exchange contracts | Other current liabilities [Member]
Derivatives designated as hedges
Other current liabilities	9	5
Derivatives not designated as hedges
Other current liabilities	9	5
Cash Flow Hedging [Member] | Commodity contracts
Derivatives designated as hedges
Notional amount	47	39
Period of derivatives designated as hedges	12 months	12 months
Derivatives not designated as hedges
Period of derivatives designated as hedges	12 months	12 months
Cash Flow Hedging [Member] | Commodity contracts | Other current assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	0	8
Derivatives not designated as hedges
Derivative asset designated as hedging instrument	0	8
Cash Flow Hedging [Member] | Commodity contracts | Other long-term assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	0	0
Derivatives not designated as hedges
Derivative asset designated as hedging instrument	0	0
Cash Flow Hedging [Member] | Commodity contracts | Other current liabilities [Member]
Derivatives designated as hedges
Other current liabilities	7	0
Derivatives not designated as hedges
Other current liabilities	7	0
Net Investment Hedging [Member] | Cross currency swaps
Derivatives designated as hedges
Notional amount		75
Period of derivatives designated as hedges		12 months
Derivatives not designated as hedges
Period of derivatives designated as hedges		12 months
Net Investment Hedging [Member] | Cross currency swaps | Other current assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument		2
Derivatives not designated as hedges
Derivative asset designated as hedging instrument		2
Net Investment Hedging [Member] | Cross currency swaps | Other long-term assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument		0
Derivatives not designated as hedges
Derivative asset designated as hedging instrument		0
Net Investment Hedging [Member] | Cross currency swaps | Other current liabilities [Member]
Derivatives designated as hedges
Other current liabilities		0
Derivatives not designated as hedges
Other current liabilities		$ 0