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Shareholder's Equity (Details) - USD ($) $ / shares in Units, shares in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
May 31, 2018 | Feb. 28, 2018 | May 31, 2017 | May 31, 2018 | May 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) |  |  |  | $ 513,000,000 | $ 152,000,000 |
Dividends declared per share (in dollars per share) | $ 0.5 | $ 0.45 | $ 0.4 | $ 0.95 | $ 0.75 |
Repurchase Program |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Remaining authorized repurchase amount | $ 827,000,000 |  |  | $ 827,000,000 |  |
Repurchase Program | CARNIVAL PLC |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Shares repurchased (in shares) | 4.7 |  |  |  |  |
Purchases of treasury stock (in dollars) | $ 312,000,000 |  |  |  |  |
Repurchase Program | Carnival Corp |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Shares repurchased (in shares) | 3.1 |  |  |  |  |
Purchases of treasury stock (in dollars) | $ 201,000,000 |  |  |  |  |

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