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Debt (Details) |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2014 | Jun. 30, 2015 USD ($) | Dec. 31, 2014 USD ($) | Aug. 18, 2015 USD ($) | May. 26, 2015 USD ($) | Dec. 31, 2013 USD ($) | Jun. 30, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt |  |  |  | $ 799,000,000 |  |  | $ 799,000,000 |
Less: short-term debt including current maturities |  |  |  | 0 |  |  | 0 |
Long-term debt | $ 1,494,000,000 |  | $ 1,494,000,000 | 799,000,000 |  |  | 799,000,000 |
Annual long term debt maturity year one |  |  |  | 0 |  |  |  |
Annual long term debt maturity year two |  |  |  | 0 |  |  |  |
Annual long term debt maturity year three |  |  |  | 0 |  |  |  |
Annual long term debt maturity year four |  |  |  | 400,000,000 |  |  |  |
Annual long term debt maturity after year five |  |  |  | 399,000,000 |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 1,000,000,000.0
Facility expiration period |  | 4 years |  |  |  |  |  |
Commercial paper |  |  |  | $ 0 |  |  | 0 |
Commitment fee minimum percentage |  |  |  | 0.20% |  |  |  |
Commitment fee maximum percentage |  |  |  | 0.45% |  |  |  |
Current commitment fee |  |  |  | 0.20% |  |  |  |
Indebtedness to cash flow |  |  |  | 3.25 |  |  |  |
4 Year Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Facility outstanding | $ 0 |  | 0 |  |  |  |  |
Term of debt instrument | 4 years |  |  |  |  |  |  |
Maximum borrowing capacity | $ 1,000,000,000.0 |  | 1,000,000,000.0 |  |  |  |  |
5 Year Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Term of debt instrument | 5 years |  |  |  |  |  |  |
Maximum borrowing capacity | $ 1,200,000,000.0 |  | $ 1,200,000,000.0 |  |  |  |  |
Current commitment fee |  |  | 0.20% |  |  |  |  |
5 Year Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Current commitment fee |  |  | 0.10% |  |  |  |  |
5 Year Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Current commitment fee |  |  | 0.20% |  |  |  |  |
Indebtedness to cash flow |  |  | 4 |  |  |  |  |
Commercial Paper [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Short-term debt |  |  |  | $ 0 |  |  | 0 |
Senior Notes One [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes |  |  |  | $ 400,000,000 |  |  | $ 400,000,000 |
Interest rate |  |  |  | 5.90% |  |  | 5.90% |
Unamortized debt discount on senior notes (less than $1 milllion for 5.9% Senior Notes) |  |  |  | $ 1,000,000 |  |  |  |
Senior Notes Two [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes |  |  |  | $ 399,000,000 |  |  | $ 399,000,000 |
Interest rate |  |  |  | 6.55% |  |  | 6.55% |
Unamortized debt discount on senior notes (less than $1 milllion for 5.9% Senior Notes) |  |  |  | $ 1,000,000 |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes | 1,494,000,000 |  | $ 1,494,000,000 | 799,000,000 |  |  |  |
Debt issued |  |  |  |  | $ 2,000,000,000 |  |  |
Senior Notes [Member] | Senior Notes One [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes | $ 400,000,000 |  | $ 400,000,000 | $ 400,000,000 |  |  |  |
Interest rate | 5.90% |  | 5.90% | 5.90% |  |  |  |
Unamortized debt discount on senior notes (less than $1 milllion for 5.9% Senior Notes) | $ 1,000,000 |  | $ 1,000,000 |  |  |  |  |
Senior Notes [Member] | Senior Notes Two [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes | $ 695,000,000 |  | $ 695,000,000 | $ 0 |  |  |  |
Debt issued |  |  |  |  |  | $ 700,000,000 |  |
Interest rate | 4.00% |  | 4.00% | 4.00% |  | 4.00% |  |
Unamortized debt discount on senior notes (less than $1 milllion for 5.9% Senior Notes) | $ 5,000,000 |  | $ 5,000,000 |  |  |  |  |
Senior Notes [Member] | Senior Notes Three [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes | $ 399,000,000 |  | $ 399,000,000 | $ 399,000,000 |  |  |  |
Interest rate | 6.55% |  | 6.55% | 6.55% |  |  |  |
Unamortized debt discount on senior notes (less than $1 milllion for 5.9% Senior Notes) | $ 1,000,000 |  | $ 1,000,000 |  |  |  |  |
Commercial Paper [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Facility outstanding |  |  |  | $ 0 |  |  |  |
Maximum borrowing capacity | $ 1,000,000,000.0 |  | $ 1,000,000,000.0 |  |  |  |  |

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