Shareholders' Equity (Details) - USD ($) $ / shares in Units, shares in Millions	3 Months Ended		9 Months Ended
	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2018	Aug. 31, 2017	Apr. 10, 2018
Equity, Class of Treasury Stock [Line Items]
Shares repurchase program, aggregate value authorized for repurchase					$ 1,000,000,000.0
Purchases of treasury stock (in dollars)			$ 1,205,000,000	$ 305,000,000
Dividends declared per share (in dollars per share)	$ 0.5	$ 0.4	$ 1.45	$ 1.15
Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Remaining authorized repurchase amount	$ 987,000,000		$ 987,000,000
Repurchase Program | CARNIVAL PLC
Equity, Class of Treasury Stock [Line Items]
Shares repurchased (in shares)			11.8
Purchases of treasury stock (in dollars)			$ 726,000,000
Repurchase Program | Carnival Corp
Equity, Class of Treasury Stock [Line Items]
Shares repurchased (in shares)			7.8
Purchases of treasury stock (in dollars)			$ 475,000,000