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Condensed Consolidating Financial Statements - Narrative (Details) - USD ($) | Dec. 31, 2019 | Nov. 26, 2019 | Jun. 30, 2018 | May 17, 2018 | Sep. 22, 2016 | Aug. 18, 2015 | May 26, 2015
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Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  | $ 2,000,000,000.0 |
Senior Notes | 2.5% Senior Notes, due 2029 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  | $ 500,000,000 |  |  |  |  |
Interest rate (as a percent) | 2.50% | 2.50% |  |  |  |  |
Senior Notes | 3.25% Senior Notes, due 2049 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  | $ 600,000,000 |  |  |  |  |
Interest rate (as a percent) | 3.25% | 3.25% |  |  |  |  |
Senior Notes | 3.3% Senior Notes, due 2020 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount | $ 700,000,000 |  |  |  |  | $ 700,000,000 |
Interest rate (as a percent) | 3.30% |  |  |  |  | 3.30% |
Senior Notes | 6.55% Senior Notes, due 2037 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount | $ 400,000,000 |  |  |  |  |  |
Interest rate (as a percent) | 6.55% |  |  |  |  |  |
Senior Notes | 4.5% Senior Notes, due 2048 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  |  | $ 500,000,000 |  |  |
Interest rate (as a percent) | 4.50% |  |  | 4.50% |  |  |
Senior Notes | 2.95% Senior Notes, due 2027 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  |  |  | $ 500,000,000 |  |
Interest rate (as a percent) | 2.95% |  |  |  | 2.95% |  |
Senior Notes | 4.0% Senior Notes, due 2025 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  | $ 700,000,000
Interest rate (as a percent) | 4.00% |  |  |  |  |  | 4.00%
Senior Notes | 2.5% Senior Notes, due 2018 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  | $ 400,000,000 |  |  | $ 400,000,000 |
Interest rate (as a percent) |  |  | 2.50% |  |  | 2.50% |
Senior Notes | 4.4% Senior Notes, due 2026 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  | $ 900,000,000 |
Interest rate (as a percent) | 4.40% |  |  |  |  | 4.40% |
S&P Financial Services LLC |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Ownership interest of subsidiary (as a percent) | 100.00% |  |  |  |  |  |

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