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Long-Term Debt - Narrative (Details) |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2018 USD ($) | Sep. 23, 2016 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Aug. 28, 2018 USD ($) | 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of senior notes |  |  | $ 1,300,000,000 | $ 400,000,000 | $ 0 |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  | 15,900,000 | 0 | $ 900,000 |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  | 78,700,000 |  |  |  |  |  |  |  |  |  |  |
$700 3.650% senior notes due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 700,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 3.65% |  |  |  |  |  |  |  |  |  |  |
$800 4.200% senior notes due 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 800,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 4.20% |  |  |  |  |  |  |  |  |  |  |
$500 2.800% senior notes due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 2.80% |  |  |  |  |  |  |  |  |  |  |
$700 3.800% senior notes due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 700,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 3.80% |  |  |  |  |  |  |  |  |  |  |
$600 3.000% senior notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |
$300 3.850% senior notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 3.85% |  |  |  |  |  |  |  |  |  |  |
$800 2.050% senior notes due 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  | $ 800,000,000 |  |  |  |  |  |  |  |  |  |
Interest rate | 2.05% |  |  | 2.05% |  |  |  |  |  |  |  |  |  |
Payment of senior notes | $ 800,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
$500 3.125% senior notes due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 3.125% |  |  |  |  |  |  |  |  |  |  |
$500 6.250% senior notes due 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 6.25% |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt | 15,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |
Credit facility | 2016 Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt term |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Additional borrowing capacity available |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Outstanding borrowings |  |  | 865,000,000 |  |  |  |  |  |  |  |  |  |  |
Consolidated total leverage ratio |  | 3.5 |  |  |  |  |  |  |  |  |  |  |  |
Credit facility | 2016 Facility | Through June 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated total leverage ratio |  |  |  |  |  |  | 4.25 |  |  |  |  |  |  |
Credit facility | 2016 Facility | Through December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated total leverage ratio |  |  |  |  |  |  | 4.00 |  |  |  |  |  |  |
Credit facility | 2016 Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated total leverage ratio |  |  |  |  |  |  |  |  | 4.0 |  |  |  |  |
Credit facility | 2016 Facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated total leverage ratio |  |  |  |  |  |  |  |  | 4.25 |  |  |  |  |
Credit facility | 2012 Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,850,000,000.00 |
Credit facility | Revolving credit facility | 2016 Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 2,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit facility | Letter of credit | 2016 Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 4,100,000,000 |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Senior notes | $700 3.650% senior notes due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  | $ 700,000,000.0 |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 3.65% |  |  |  |  |  |  |  |
Senior notes | $800 4.200% senior notes due 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  | $ 800,000,000.0 |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 4.20% |  |  |  |  |  |  |  |
Senior notes | $500 2.800% senior notes due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 2.80% |  |  |  |  |  |
Senior notes | $700 3.800% senior notes due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  | $ 700,000,000 |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 3.80% |  |  |  |  |  |
Senior notes | $600 3.000% senior notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  | $ 600,000,000 |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |
Senior notes | $300 3.850% senior notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  | $ 300,000,000 |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 3.85% |  |  |  |
Senior notes | $800 2.050% senior notes due 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  | $ 800,000,000 |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  | 2.05% |  |  |
Senior notes | $500 3.125% senior notes due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  | 3.125% |  |
Senior notes | $500 6.250% senior notes due 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.25%
Payment of senior notes | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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