Derivative Financial Instruments And Fair Value Measurements (Summary Of Various Interest Rate Agreements) (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended
	Mar. 30, 2012	Mar. 31, 2012
0.415% To 0.418% [Member]
Derivative [Line Items]
Expiration Date		Dec. 31, 2012	[1]
Notional Amounts		$ 500	[1]
Decrease in notional amount	400
0.415% To 0.418% [Member] | Interest Rate Swap Contracts [Member]
Derivative [Line Items]
Fixed Interest Rates, Low		0.415%
Fixed Interest Rates, High		0.418%
1.60% To 1.84% [Member]
Derivative [Line Items]
Expiration Date		Dec. 31, 2013
Notional Amounts		800
1.60% To 1.84% [Member] | Interest Rate Swap Contracts [Member]
Derivative [Line Items]
Fixed Interest Rates, Low		1.60%
Fixed Interest Rates, High		1.84%
2.75% To 2.84% [Member]
Derivative [Line Items]
Expiration Date		Mar. 31, 2016
Notional Amounts		200
2.75% To 2.84% [Member] | Interest Rate Swap Contracts [Member]
Derivative [Line Items]
Fixed Interest Rates, Low		2.75%
Fixed Interest Rates, High		2.84%
2.70% To 3.17% [Member]
Derivative [Line Items]
Expiration Date		Mar. 31, 2017
Notional Amounts		$ 650
2.70% To 3.17% [Member] | Interest Rate Swap Contracts [Member]
Derivative [Line Items]
Fixed Interest Rates, Low		2.70%
Fixed Interest Rates, High		3.17%

[1] In September 2011, we entered into forward-starting interest rate swap agreements with an effective date of December 30, 2011. The notional amounts of the swap agreements decreased by $400 million on March 30, 2012 and the remaining notional amounts shown in the table above expire on December 31, 2012.