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v3.20.1

Unsecured Debt (Details) - USD ($) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Feb. 29, 2020 | Dec. 31, 2019 | Feb. 29, 2020 | Feb. 28, 2019
Export credit facility | Export credit facility due 2032 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from long-term debt |  | $ 823,000,000 |  |
Sterling-denominated floating rate bank loan | Sterling-denominated floating rate bank loan due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from long-term debt | $ 452,000,000 |  |  |
Commercial paper |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Current unsecured debt | $ 1,000,000,000.0 |  | $ 1,000,000,000.0 |
Proceeds from short term debt |  |  | $ 0 | $ 0

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