Risk Management (Narrative) (Details) (USD $)	Oct. 01, 2011	Dec. 31, 2010
Notional amount of foreign currency derivatives	$ 606,000,000	$ 1,500,000,000
Number of net notional positions to buy or sell foreign currency disclosed (in number of positions)	5	5
Principal amount outstanding	2,100,000,000
Fair value of derivative liabilities	7,000,000	18,000,000
Aggregate credit risk with all counterparties	5,000,000
Long-term debt, fair value	2,200,000,000
Long-term debt, face value	2,100,000,000
Not Designated As Hedging Instrument [Member]
Fair value of derivative liabilities	4,000,000	18,000,000
Not Designated As Hedging Instrument [Member] | Interest Rate Contracts [Member] | Other Liabilities [Member]
Fair value of derivative liabilities	$ 3,000,000	$ 3,000,000