Risk Management (Narrative) (Details) (USD $)	Mar. 30, 2013 position	Dec. 31, 2012 position
Derivative [Line Items]
Notional amount of foreign currency derivatives	$ 618,000,000	$ 523,000,000
Number of net notional positions to buy or sell foreign currency disclosed (in number of positions)	5	5
Fair value of derivative liabilities	8,000,000	7,000,000
Aggregate credit risk with all counterparties	2,000,000
Interest Rate Contracts [Member]
Derivative [Line Items]
Principal amount outstanding	2,500,000,000
Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Fair value of derivative liabilities	8,000,000	7,000,000
Not Designated As Hedging Instruments [Member] | Interest Rate Contracts [Member] | Other Liabilities [Member]
Derivative [Line Items]
Fair value of derivative liabilities	$ 4,000,000	$ 4,000,000