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Fair Value - Fair Value of Debt (Details) - USD ($) | Dec. 31, 2018 | Aug. 28, 2018 | Dec. 19, 2016 | Dec. 07, 2015 | Nov. 21, 2012
--- | --- | --- | --- | --- | ---
$600 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 |  |  |  |
Interest rate | 3.00% |  |  |  |
$500 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 |  |  |  |
Interest rate | 2.80% |  |  |  |
$500 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 |  |  |  |
Interest rate | 3.125% |  |  |  |
$700 3.650% senior notes due 2023 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Face amount of debt | $ 700,000,000 |  |  |  |
Interest rate | 3.65% |  |  |  |
$300 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 |  |  |  |
Interest rate | 3.85% |  |  |  |
$700 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 |  |  |  |
Interest rate | 3.80% |  |  |  |
$800 4.200% senior notes due 2028 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Face amount of debt | $ 800,000,000 |  |  |  |
Interest rate | 4.20% |  |  |  |
Senior notes |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Face amount of debt | $ 4,100,000,000 |  |  |  |
Senior notes | $600 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 |
Interest rate |  |  |  | 3.00% |
Senior notes | $600 3.000% senior notes due 2020 | Fair Value, Inputs, Level 2 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of debt | 599,000,000 |  |  |  |
Senior notes | $500 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 |  |
Interest rate |  |  | 2.80% |  |
Senior notes | $500 2.800% senior notes due 2021 | Fair Value, Inputs, Level 2 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of debt | 490,000,000 |  |  |  |
Senior notes | $500 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
Interest rate |  |  |  |  | 3.125%
Senior notes | $500 3.125% senior notes due 2022 | Fair Value, Inputs, Level 2 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of debt | 488,000,000 |  |  |  |
Senior notes | $700 3.650% senior notes due 2023 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Face amount of debt |  | $ 700,000,000.0 |  |  |
Interest rate |  | 3.65% |  |  |
Senior notes | $700 3.650% senior notes due 2023 | Fair Value, Inputs, Level 2 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of debt | 697,000,000 |  |  |  |
Senior notes | $300 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 |
Interest rate |  |  |  | 3.85% |
Senior notes | $300 3.850% senior notes due 2025 | Fair Value, Inputs, Level 2 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of debt | 295,000,000 |  |  |  |
Senior notes | $700 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 |  |
Interest rate |  |  | 3.80% |  |
Senior notes | $700 3.800% senior notes due 2026 | Fair Value, Inputs, Level 2 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of debt | 682,000,000 |  |  |  |
Senior notes | $800 4.200% senior notes due 2028 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Face amount of debt |  | $ 800,000,000.0 |  |  |
Interest rate |  | 4.20% |  |  |
Senior notes | $800 4.200% senior notes due 2028 | Fair Value, Inputs, Level 2 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of debt | $ 793,000,000 |  |  |  |

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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 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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