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Debt (Details) |  |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 15, 2016 USD ($) | Mar. 17, 2016 USD ($) | May 29, 2015 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Mar. 28, 2013 USD ($)
Debt |  |  |  |  |  |
Proceeds from issuance of debt |  | $ 896,000,000 |  |  |  |
Notes repaid and retired |  |  |  | $ 1,300,000,000 | $ 500,000,000 |
3.5% Notes and Debentures Due April 1, 2021 |  |  |  |  |  |
Debt |  |  |  |  |  |
Long-term debt, gross |  | $ 400,000,000 |  |  |  |
Interest rate (as a percent) |  | 3.50% |  |  |  |
4.375% Notes and Debentures Due April 1, 2026 |  |  |  |  |  |
Debt |  |  |  |  |  |
Long-term debt, gross |  | $ 500,000,000 |  |  |  |
Interest rate (as a percent) |  | 4.375% |  |  |  |
6.125% Notes and Debentures Due October 3, 2016 |  |  |  |  |  |
Debt |  |  |  |  |  |
Interest rate (as a percent) | 6.125% |  |  |  |  |
Notes repaid and retired | $ 1,000,000,000 |  |  |  |  |
5.85% Notes and Debenture Due March 15, 2017 |  |  |  |  |  |
Debt |  |  |  |  |  |
Interest rate (as a percent) | 5.85% |  |  |  |  |
Notes repaid and retired | $ 300,000,000 |  |  |  |  |
5.85% and 6.125% Notes and Debentures |  |  |  |  |  |
Debt |  |  |  |  |  |
Interest expense, debt |  |  |  | 40,000,000 |  |
Credit Agreement dated March 28, 2013 |  |  |  |  |  |
Debt |  |  |  |  |  |
Borrowing capacity, maximum |  |  |  |  |  | $ 1,250,000,000
Credit agreement dated May 29, 2015 and August 28, 2015, as amended |  |  |  |  |  |
Debt |  |  |  |  |  |
Borrowing capacity, maximum |  |  | $ 750,000,000 |  |  |
Increase in maximum borrowing capacity |  |  | $ 375,000,000 |  |  |
Outstanding and unused Letters of Credit |  |  |  | 0 |  |
Maximum net leverage ratio |  |  | 4 |  |  |
Minimum interest coverage ratio |  |  | 2.5 |  |  |
Credit agreement dated May 29, 2015 and August 28, 2015, as amended | Federal funds effective rate |  |  |  |  |  |
Debt |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  | 0.50% |  |  |
Credit agreement dated May 29, 2015 and August 28, 2015, as amended | Libor rate |  |  |  |  |  |
Debt |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  | 1.00% |  |  |
Credit agreement dated May 29, 2015 and August 28, 2015, as amended | Revolver |  |  |  |  |  |
Debt |  |  |  |  |  |
Borrowing capacity, maximum |  |  |  | 500,000,000 |  |
Credit agreement dated May 29, 2015 and August 28, 2015, as amended | Swingline loans |  |  |  |  |  |
Debt |  |  |  |  |  |
Borrowing capacity, maximum |  |  |  | 75,000,000 |  |
Credit agreement dated May 29, 2015 and August 28, 2015, as amended | Letters of credit |  |  |  |  |  |
Debt |  |  |  |  |  |
Borrowing capacity, maximum |  |  |  | 100,000,000 |  |
Outstanding and unused Letters of Credit |  |  |  | $ 1,500,000 |  |

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