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Shareholders' Equity - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			1 Months Ended
	Feb. 28, 2013	Feb. 28, 2013 Carnival Corp	Feb. 28, 2013 CARNIVAL PLC	Mar. 21, 2013 Subsequent Event	Mar. 21, 2013 Subsequent Event Carnival Corp
Stockholders' Equity Note [Line Items]
Repurchase of Common Stock (in shares)		2.1	0.9		225.0
Share repurchased, Value	$ 113.0	$ 78.0			$ 8.1
Stock repurchase program, remaining authorized amount				991
Treasury Stock Sold (in shares)			0.9
Sales of treasury stock	$ 35		$ 35

The cash outflow to reacquire common stock during the period.

The cash inflow from the issuance of an equity stock that has been previously reacquired by the entity.