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Long-Term Debt (Details) |  |  | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 15, 2017 USD ($) | Sep. 23, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 27, 2016 | Dec. 19, 2016 USD ($) | Dec. 02, 2016 | Dec. 07, 2015 USD ($) | Jun. 06, 2013 USD ($) | Nov. 21, 2012 USD ($) | Jul. 27, 2012 USD ($) | Sep. 30, 2009 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  | $ 75,900,000 |  |  |  |  |  |  |  |
Redemption price percentage |  |  | 100.00% |  |  |  |  |  |  |  |
Credit Facility Member 2016 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  | 5 years |  |  |  |  |  |  |  |  |
Current borrowing capacity |  | $ 2,500,000,000 |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 1,300,000,000 |  |  |  |  |  |  |  |
Consolidated total leverage ratio |  | 3.5 |  |  |  |  |  |  |  |  |
Credit Facility Member 2016 | Through June 30, 2017 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consolidated total leverage ratio |  |  |  | 4.25 |  |  |  |  |  |  |
Credit Facility Member 2016 | Through December 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consolidated total leverage ratio |  |  |  | 4.00 |  |  |  |  |  |  |
Credit Facility Member 2016 | Maximum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Current borrowing capacity |  | $ 500,000,000 |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  | $ 150,000,000 |  |  |  |  |  |  |  |  |
Consolidated total leverage ratio |  |  |  |  |  | 4.25 |  |  |  |  |
Credit Facility Member 2016 | Minimum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consolidated total leverage ratio |  |  |  |  |  | 4.0 |  |  |  |  |
Credit Facility Member 2012 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Current borrowing capacity |  |  |  |  |  |  |  |  |  | $ 1,850,000,000 |
$500 million 2.800% senior notes due 2021 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 500,000,000 |  | $ 500,000,000 |  |  |  |  |  |
Interest rate |  |  | 2.80% |  | 2.80% |  |  |  |  |  |
$700 million 3.800% senior notes due 2026 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 700,000,000 |  | $ 700,000,000 |  |  |  |  |  |
Interest rate |  |  | 3.80% |  | 3.80% |  |  |  |  |  |
$600 million 3.000% senior notes due 2020 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 600,000,000 |  |  |  | $ 600,000,000 |  |  |  |
Interest rate |  |  | 3.00% |  |  |  | 3.00% |  |  |  |
$300 million 3.850% senior notes due 2025 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 300,000,000 |  |  |  | $ 300,000,000 |  |  |  |
Interest rate |  |  | 3.85% |  |  |  | 3.85% |  |  |  |
$800 million 2.050% senior notes due 2018 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 800,000,000 |  |  |  |  | $ 800,000,000 |  |  |
Interest rate |  |  | 2.05% |  |  |  |  | 2.05% |  |  |
$500 million 3.125% senior notes due 2022 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 500,000,000 |  |  |  |  |  | $ 500,000,000 |  |
Interest rate |  |  | 3.125% |  |  |  |  |  | 3.125% |  |
$500 million 6.250% senior notes due 2019 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 500,000,000 |  |  |  |  |  |  |  | $ 500,000,000
Interest rate |  |  | 6.25% |  |  |  |  |  |  |  | 6.25%
$400 million 1.850% senior notes due 2017 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of debt | $ 400,000,000 |  | $ 400,000,000 |  |  |  |  |  |  |  |
Repayments of debt | $ 400,000,000 |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 1.85% |  |  |  |  |  |  |  |
Senior Notes Total |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 3,900,000,000 |  |  |  |  |  |  |  |
Capital Lease Obligations And Foreign Letter Of Credit Issuance |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 3,100,000 |  |  |  |  |  |  |  |

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