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Financial Instruments - (Narratives) (Details) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | May 16, 2018 USD ($) | Jul. 31, 2017 GBP (£) | Jul. 31, 2017 EUR (€) | Jul. 10, 2017 GBP (£) | Jul. 10, 2017 EUR (€) | Jun. 30, 2017 GBP (£) instrument | Jun. 30, 2017 EUR (€) instrument
Senior notes, GBP notes due 2022, interest payable at 1.700% |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |
Face amount of loans | £ |  |  |  | £ 300,000,000 |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |
Face amount of loans |  |  | $ 1,000,000,000 |  |  | £ 300,000,000 | € 1,000,000,000 |  |
Senior notes | Senior notes, Euro notes due 2021, interest payable at 0.400% |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |
Face amount of loans | € |  |  |  |  | € 500,000,000 |  | 500,000,000 |  |
Senior notes | Senior notes, Euro notes due 2024, interest payable at 1.100% |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |
Face amount of loans | € |  |  |  |  | € 500,000,000 |  | € 500,000,000 |  |
Senior notes | Senior notes, GBP notes due 2022, interest payable at 1.700% |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |
Face amount of loans | £ |  |  |  |  |  | £ 300,000,000 |  |  |
Interest rate swap |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | $ | $ 0 | $ 0 |  |  |  |  |  |  |
Currency forward contract | Net investment hedging |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | £ 298,000,000 | € 999,000,000
Number of instruments held | instrument |  |  |  |  |  |  |  | 2 | 2
Amount of gains reclassified from AOCE into income | $ | $ 67,000,000 | $ 28,000,000 |  |  |  |  |  |  |

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