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Unsecured Debt (Details) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2018 | Mar. 31, 2018 | Jan. 31, 2018 | Dec. 31, 2017 | May 31, 2018 | May 31, 2017
Sterling-denominated floating rate bank loan due December 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from long-term debt |  |  |  | $ 469 |  |
Senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of long-term debt |  |  |  | $ 500 |  |
Euro floating rate bank loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of long-term debt |  |  | $ 365 |  |  |
Euro-denominated floating rate bank loan due 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from long-term debt |  | $ 370 |  |  |  |
Export credit facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from long-term debt | $ 224 | $ 555 |  |  |  |
Commercial paper |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Current unsecured debt |  |  |  |  | $ 606 |
Proceeds from short term debt |  |  |  |  | 2 | $ 111
Repayments of short term debt |  |  |  |  | 2 | $ 364
Euro-denominated bank loan | Euro-denominated bank loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Current unsecured debt |  |  |  |  | $ 231 |

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