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Unsecured Debt (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Feb. 28, 2019 | Dec. 31, 2018 | Feb. 28, 2019 | Feb. 28, 2018
Euro-denominated bank loan | Export credit facility due 2031 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from long-term debt | $ 587 |  |  |
Export credit facility | Export credit facility due 2031 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from long-term debt |  | $ 852 |  |
Export credit facility | Export credit facility due 2035 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity | 899 |  | $ 899 |
Commercial paper |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Current unsecured debt | $ 768 |  | 768 |
Proceeds from short term debt |  |  | 0 | $ 2
Repayments of short term debt |  |  | $ 0 | $ 0

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