SENIOR LONG-TERM DEBT (Schedule of Debt) (Details) (USD $) In Millions, unless otherwise specified	May 26, 2013	Feb. 24, 2013	May 27, 2012
Debt Instrument [Line Items]
Senior notes	$ 9,292.2		$ 2,938.8
Unamortized fair value adjustment of senior debt in connection with Ralcorp	161.6		0
Unamortized discounts/premiums	(57.5)		(59.8)
Adjustment due to hedging activity	8.5		17.7
Less current installments	(517.9)		(38.1)
Total long-term debt	8,886.9		2,858.6
Interest rate	3.25%
4.65% Senior Debt Due January 2043
Debt Instrument [Line Items]
Senior notes	1,000.0	1,000.0	0
Interest rate	4.65%
6.625% Senior Debt Due August 2039 (Including Ralcorp Senior Notes)
Debt Instrument [Line Items]
Senior notes	450.0		0
Interest rate	6.625%
8.25% Senior Debt Due September 2030
Debt Instrument [Line Items]
Senior notes	300.0		300.0
Interest rate	8.25%
7.0% Senior Debt Due October 2028
Debt Instrument [Line Items]
Senior notes	382.2		382.2
Interest rate	7.00%
6.7% Senior Debt Due August 2027
Debt Instrument [Line Items]
Senior notes	9.2		9.2
Interest rate	6.70%
7.125% Senior Debt Due October 2026
Debt Instrument [Line Items]
Senior notes	372.4		372.4
Interest rate	7.125%
3.2% Senior Debt Due January 2023
Debt Instrument [Line Items]
Senior notes	1,225.0	1,225.0	0
Interest rate	3.20%
3.25% Senior Debt Due September 2022
Debt Instrument [Line Items]
Senior notes	250.0		0
Interest rate	3.25%
9.75% Subordinated Debt Due March 2021
Debt Instrument [Line Items]
Senior notes	195.9		195.9
Interest rate	9.75%
4.95% Senior Debt Due August 2020 (Including Ralcorp Senior Notes)
Debt Instrument [Line Items]
Senior notes	300.0		0
Interest rate	4.95%
7.0% Senior Debt Due April 2019
Debt Instrument [Line Items]
Senior notes	500.0		500.0
Interest rate	7.00%
1.9% Senior Debt Due January 2018
Debt Instrument [Line Items]
Senior notes	1,000.0	1,000.0	0
Interest rate	1.90%
LIBOR plus 1.75% term loans due January 2018
Debt Instrument [Line Items]
Senior notes	900.0		0
Interest rate	1.75%
2.1% Senior Debt Due March 2018
Debt Instrument [Line Items]
Senior notes	250.0		0
Interest rate	2.10%
5.819% Senior Debt Due June 2017
Debt Instrument [Line Items]
Senior notes	500.0		500.0
Interest rate	5.819%
1.3% Senior Debt Due January 2016
Debt Instrument [Line Items]
Senior notes	750.0	750.0	0
Interest rate	1.30%
1.35% Senior Debt Due September 2015
Debt Instrument [Line Items]
Senior notes	250.0		0
Interest rate	1.35%
5.875% Senior Debt Due April 2014
Debt Instrument [Line Items]
Senior notes	500.0		500.0
Interest rate	5.875%
2.00% to 9.59% Lease Financing Obligations Due Through 2029
Debt Instrument [Line Items]
Senior notes	77.4		106.0
Other Indebtedness
Debt Instrument [Line Items]
Senior notes	$ 80.1		$ 73.1
Minimum | 2.00% to 9.59% Lease Financing Obligations Due Through 2029
Debt Instrument [Line Items]
Interest rate	2.00%
Maximum | 2.00% to 9.59% Lease Financing Obligations Due Through 2029
Debt Instrument [Line Items]
Interest rate	9.59%