Derivative Financial Instruments and Hedging Activities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Debt denominated in foreign currency designated as non-derivative net investment hedging instrument	$ 97	$ 95
Percentage of intercompany balance sheet exposure	100.00%
Other current assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	12	13
Other long-term assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	39	36
Other current liabilities [Member]
Derivatives designated as hedges
Derivative liability designated as hedging instrument	3	4
Other long-term liabilities [Member]
Derivatives designated as hedges
Derivative liability designated as hedging instrument	49	76
Currency exchange contracts [Member]
Derivatives not designated as hedges
Period of derivatives not designated as hedges	1 to 12 months	1 to 12 months
Currency exchange contracts [Member] | Other current assets [Member]
Derivatives not designated as hedges
Derivative instruments not designated as hedging instruments, asset, at fair value	23	22
Currency exchange contracts [Member] | Other current liabilities [Member]
Derivatives not designated as hedges
Derivative instruments not designated as hedging instruments, liability, at fair value	21	26
Fair Value Hedging [Member] | Fixed-to-floating interest rate swaps [Member]
Derivatives designated as hedges
Period of derivatives designated as hedges	3 to 20 years	3 months to 20 years
Fair Value Hedging [Member] | Fixed-to-floating interest rate swaps [Member] | Other current assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	0	1
Fair Value Hedging [Member] | Fixed-to-floating interest rate swaps [Member] | Other long-term assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	39	36
Fair Value Hedging [Member] | Fixed-to-floating interest rate swaps [Member] | Other current liabilities [Member]
Derivatives designated as hedges
Derivative liability designated as hedging instrument	0	0
Fair Value Hedging [Member] | Fixed-to-floating interest rate swaps [Member] | Other long-term liabilities [Member]
Derivatives designated as hedges
Derivative liability designated as hedging instrument	49	76
Cash Flow Hedging [Member] | Floating-to-fixed interest rate swaps [Member]
Derivatives designated as hedges
Period of derivatives designated as hedges	3 months	6 months
Cash Flow Hedging [Member] | Floating-to-fixed interest rate swaps [Member] | Other current assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	0	0
Cash Flow Hedging [Member] | Floating-to-fixed interest rate swaps [Member] | Other long-term assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	0	0
Cash Flow Hedging [Member] | Floating-to-fixed interest rate swaps [Member] | Other current liabilities [Member]
Derivatives designated as hedges
Derivative liability designated as hedging instrument	0	1
Cash Flow Hedging [Member] | Floating-to-fixed interest rate swaps [Member] | Other long-term liabilities [Member]
Derivatives designated as hedges
Derivative liability designated as hedging instrument	0	0
Cash Flow Hedging [Member] | Currency exchange contracts [Member]
Derivatives designated as hedges
Period of derivatives designated as hedges	12 to 36 months	12 to 36 months
Cash Flow Hedging [Member] | Currency exchange contracts [Member] | Other current assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	12	12
Cash Flow Hedging [Member] | Currency exchange contracts [Member] | Other long-term assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	0	0
Cash Flow Hedging [Member] | Currency exchange contracts [Member] | Other current liabilities [Member]
Derivatives designated as hedges
Derivative liability designated as hedging instrument	3	3
Cash Flow Hedging [Member] | Currency exchange contracts [Member] | Other long-term liabilities [Member]
Derivatives designated as hedges
Derivative liability designated as hedging instrument	0	0
Cash Flow Hedging [Member] | Commodity contracts [Member]
Derivatives designated as hedges
Period of derivatives designated as hedges	1 to 12 months	1 to 12 months
Cash Flow Hedging [Member] | Commodity contracts [Member] | Other current assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	0	0
Cash Flow Hedging [Member] | Commodity contracts [Member] | Other long-term assets [Member]
Derivatives designated as hedges
Derivative asset designated as hedging instrument	0	0
Cash Flow Hedging [Member] | Commodity contracts [Member] | Other current liabilities [Member]
Derivatives designated as hedges
Derivative liability designated as hedging instrument	0	0
Cash Flow Hedging [Member] | Commodity contracts [Member] | Other long-term liabilities [Member]
Derivatives designated as hedges
Derivative liability designated as hedging instrument	0	0
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Fixed-to-floating interest rate swaps [Member]
Derivatives not designated as hedges
Notional amount	3,290	3,090
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Floating-to-fixed interest rate swaps [Member]
Derivatives not designated as hedges
Notional amount	300	300
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Currency exchange contracts [Member]
Derivatives not designated as hedges
Notional amount	495	393
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Commodity contracts [Member]
Derivatives not designated as hedges
Notional amount	1	1
Not Designated as Hedging Instrument [Member] | Currency exchange contracts [Member]
Derivatives not designated as hedges
Notional amount	$ 4,160	$ 4,277