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Unsecured Debt (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Apr. 30, 2018 | Mar. 31, 2018 | Jan. 31, 2018 | Dec. 31, 2017 | Aug. 31, 2018 | Aug. 31, 2017 | Jun. 30, 2018
Senior notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  | $ 500 |  |  |
Euro-denominated bank loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of long-term debt |  |  | $ 365 |  |  |  |
Euro-denominated bank loan | Bank loan due 2020 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from long-term debt |  | $ 370 |  |  |  |  |
Sterling-denominated bank loan | Bank loan due 2022 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from long-term debt |  |  |  | $ 469 |  |  |
Export credit facility | Export credit facility due 2030 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from long-term debt | $ 229 | $ 567 |  |  |  |  |
Export credit facility | Export credit facility due 2034 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  | $ 914
Commercial paper |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Current unsecured debt |  |  |  |  | $ 398 |  |
Proceeds from short term debt |  |  |  |  | 2 | $ 111 |
Repayments of short term debt |  |  |  |  | 2 | $ 364 |
Euro-denominated bank loan | Bank loan due 2019 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Current unsecured debt |  |  |  |  | $ 234 |  |

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