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Shareholder's Equity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 23, 2016 | Aug. 31, 2016 | Aug. 31, 2015 | Aug. 31, 2016 | Aug. 31, 2015 | Nov. 30, 2015 | Jun. 27, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Purchases of treasury stock |  |  |  | $ 2,110 | $ 166 |  |
Sales of treasury stock |  |  |  | $ 40 | $ 167 |  |
Dividends Declared Per Share (in dollars per share) |  | $ 0.35 | $ 0.30 | $ 1.00 | $ 0.80 |  |
Common Stock |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Increase in dividend rate (as a percent) |  |  |  | 17.00% |  |  |
Dividends Declared Per Share (in dollars per share) |  |  |  | $ 0.35 |  | $ 0.30 |
Ordinary Shares |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Increase in dividend rate (as a percent) |  |  |  | 17.00% |  |  |
Dividends Declared Per Share (in dollars per share) |  |  |  | $ 0.35 |  | $ 0.30 |
Carnival Corp |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Shares repurchased (in shares) |  |  |  | 43,600 |  |  |
Purchases of treasury stock |  |  |  | $ 2,100 |  |  |
Stock Repurchase Program, Authorized Amount, Increase |  |  |  |  |  |  | $ 1,000
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 | Carnival Corp |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Shares repurchased (in shares) | 2,300 |  |  |  |  |  |
Purchases of treasury stock | $ 107 |  |  |  |  |  |
Remaining number of shares available under the Repurchase Program (in shares) | $ 500 |  |  |  |  |  |

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