Shareholder's Equity (Details) - USD ($) shares in Millions, $ in Millions	1 Months Ended	3 Months Ended
	Mar. 24, 2017	Feb. 28, 2017	Feb. 29, 2016
Equity, Class of Treasury Stock [Line Items]
Purchases of treasury stock		$ 69	$ 916
Carnival Corp
Equity, Class of Treasury Stock [Line Items]
Shares repurchased (in shares)		1.4
Purchases of treasury stock		$ 75
Subsequent Event | Carnival Corp
Equity, Class of Treasury Stock [Line Items]
Shares repurchased (in shares)	0.8
Purchases of treasury stock	$ 44
Remaining number of shares available under the Repurchase Program (in shares)	$ 280