Shareholder's Equity (Details) - USD ($) shares in Thousands, $ in Millions	1 Months Ended	3 Months Ended
	Mar. 25, 2016	Feb. 29, 2016	Feb. 28, 2015
Equity, Class of Treasury Stock [Line Items]
Purchases of treasury stock		$ 916	$ 0
Sales of treasury stock		$ 40	$ 0
Carnival Corp
Equity, Class of Treasury Stock [Line Items]
Shares repurchased (in shares)		18,400
Purchases of treasury stock		$ 877
Carnival Corp
Equity, Class of Treasury Stock [Line Items]
Shares repurchased (in shares)		891
Treasury stock sold (in shares)		891
Sales of treasury stock		$ 40
Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Remaining number of shares available under the Repurchase Program (in shares)	$ 698
Subsequent Event | Carnival Corp
Equity, Class of Treasury Stock [Line Items]
Shares repurchased (in shares)	2,600
Purchases of treasury stock	$ 124