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Commercial Paper (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015 | Oct. 31, 2014
Short-term Debt [Line Items] |  |  |
Outstanding borrowings | $ 300,000,000 | $ 299,000,000 |
Commercial Paper |  |  |
Short-term Debt [Line Items] |  |  |
Maximum borrowing capacity |  |  | $ 1,000,000,000
Maximum amount outstanding during period | 475,000,000 |  |
Outstanding borrowings | $ 300,000,000 | $ 299,000,000 |

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