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Fair Value - Fair Value of Debt (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 19, 2016 | Dec. 07, 2015 | Jun. 06, 2013 | Nov. 21, 2012 | Sep. 30, 2009
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Senior Notes Total |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Face amount of debt | $ 3,900,000,000 |  |  |  |  |  |
$800 million 2.050% senior notes due 2018 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Face amount of debt | 800,000,000 |  |  |  | $ 800,000,000 |  |
Fair value of debt | $ 800,000,000 | $ 800,000,000 |  |  |  |  |
Interest rate | 2.05% |  |  |  | 2.05% |  |
$800 million 2.050% senior notes due 2018 | Fair Value, Inputs, Level 2 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Face amount of debt | $ 800,000,000 |  |  |  |  |  |
Fair value of debt | $ 800,000,000 |  |  |  |  |  |
Interest rate | 2.05% |  |  |  |  |  |
$500 million 6.250% senior notes due 2019 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Face amount of debt | $ 500,000,000 |  |  |  |  |  | $ 500,000,000
Fair value of debt | $ 500,000,000 | 500,000,000 |  |  |  |  |
Interest rate | 6.25% |  |  |  |  |  | 6.25%
$500 million 6.250% senior notes due 2019 | Fair Value, Inputs, Level 2 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Face amount of debt | $ 500,000,000 |  |  |  |  |  |
Fair value of debt | $ 531,000,000 |  |  |  |  |  |
Interest rate | 6.25% |  |  |  |  |  |
$600 million 3.000% senior notes due 2020 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Face amount of debt | $ 600,000,000 |  |  | $ 600,000,000 |  |  |
Fair value of debt | $ 600,000,000 | 600,000,000 |  |  |  |  |
Interest rate | 3.00% |  |  | 3.00% |  |  |
$600 million 3.000% senior notes due 2020 | Fair Value, Inputs, Level 2 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Face amount of debt | $ 600,000,000 |  |  |  |  |  |
Fair value of debt | $ 608,000,000 |  |  |  |  |  |
Interest rate | 3.00% |  |  |  |  |  |
$500 million 2.800% senior notes due 2021 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Face amount of debt | $ 500,000,000 |  | $ 500,000,000 |  |  |  |
Fair value of debt | $ 500,000,000 | 500,000,000 |  |  |  |  |
Interest rate | 2.80% |  | 2.80% |  |  |  |
$500 million 2.800% senior notes due 2021 | Fair Value, Inputs, Level 2 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Face amount of debt | $ 500,000,000 |  |  |  |  |  |
Fair value of debt | $ 501,000,000 |  |  |  |  |  |
Interest rate | 2.80% |  |  |  |  |  |
$500 million 3.125% senior notes due 2022 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Face amount of debt | $ 500,000,000 |  |  |  |  | $ 500,000,000 |
Fair value of debt | $ 500,000,000 | 500,000,000 |  |  |  |  |
Interest rate | 3.125% |  |  |  |  | 3.125% |
$500 million 3.125% senior notes due 2022 | Fair Value, Inputs, Level 2 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Face amount of debt | $ 500,000,000 |  |  |  |  |  |
Fair value of debt | $ 505,000,000 |  |  |  |  |  |
Interest rate | 3.125% |  |  |  |  |  |
$300 million 3.850% senior notes due 2025 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Face amount of debt | $ 300,000,000 |  |  | $ 300,000,000 |  |  |
Fair value of debt | $ 300,000,000 | 300,000,000 |  |  |  |  |
Interest rate | 3.85% |  |  | 3.85% |  |  |
$300 million 3.850% senior notes due 2025 | Fair Value, Inputs, Level 2 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Face amount of debt | $ 300,000,000 |  |  |  |  |  |
Fair value of debt | $ 311,000,000 |  |  |  |  |  |
Interest rate | 3.85% |  |  |  |  |  |
$700 million 3.800% senior notes due 2026 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Face amount of debt | $ 700,000,000 |  | $ 700,000,000 |  |  |  |
Fair value of debt | $ 700,000,000 | $ 700,000,000 |  |  |  |  |
Interest rate | 3.80% |  | 3.80% |  |  |  |
$700 million 3.800% senior notes due 2026 | Fair Value, Inputs, Level 2 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Face amount of debt | $ 700,000,000 |  |  |  |  |  |
Fair value of debt | $ 723,000,000 |  |  |  |  |  |
Interest rate | 3.80% |  |  |  |  |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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