Debt Obligations And Commitments (Narrative) (Details) (USD $)	Mar. 24, 2012
Debt Instrument [Line Items]
Commercial paper outstanding	$ 1,200,000,000
0.750% Senior Notes [Member]
Debt Instrument [Line Items]
Fixed and floating rate notes issued	750,000,000
Interest rate on debt	0.75%
Debt instrument maturity year	2015
2.750% Senior Notes [Member]
Debt Instrument [Line Items]
Fixed and floating rate notes issued	1,250,000,000
Interest rate on debt	2.75%
Debt instrument maturity year	2022
4.000% Senior Notes [Member]
Debt Instrument [Line Items]
Fixed and floating rate notes issued	$ 750,000,000
Interest rate on debt	4.00%
Debt instrument maturity year	2042