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Debt (Details) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2015 EUR (€) | May. 20, 2015 USD ($) | Feb. 02, 2015 USD ($) | Dec. 31, 2014 USD ($) credit_facility
Debt Instrument [Line Items] |  |  |  |  |  |
Number Of Credit Facilities | credit_facility |  |  |  |  |  | 2
Commercial paper [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt | $ 125,000,000 | $ 125,000,000 |  |  |  | $ 168,000,000
Weighted average commercial paper outstanding | $ 359,000,000 | $ 338,000,000 |  |  |  |
Weighted-average interest rates (as a percent) | 0.46% | 0.48% |  |  |  |
4.750% Senior Notes Due May 2045 [Member] | Notes Payable, Other Payables [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount of debt |  |  |  | $ 600,000,000 |  |
Debt interest rate percentage |  |  |  | 4.75% |  |
Domestic Line of Credit [Member] | 2017 Facility [Member] | Line of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | $ 400,000,000
Foreign Line of Credit [Member] | 2015 Facility [Member] | Line of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 726,000,000 | $ 726,000,000 | € 650,000,000 |  |  |
Foreign Line of Credit [Member] | 2020 Facility [Member] | Line of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | $ 900,000,000 |
Commercial paper [Member] | US Commercial Paper Program [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 900,000,000 | $ 900,000,000 |  |  |  |
Commercial paper [Member] | European Multi Currency Paper Program [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | € |  |  | € 300,000,000 |  |  |

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