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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 |  |

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