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Debt Debt - Term Loan (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Aug. 22, 2019 | Aug. 22, 2018 | Dec. 31, 2016
Debt Instrument, Term Loan [Line Items] |  |  |  |
Debt Instrument, Face Amount | $ 9,081 |  |  | $ 9,989
Term Loan [Member] |  |  |  |
Debt Instrument, Term Loan [Line Items] |  |  |  |
Debt Instrument, Term | 5 years |  |  |
Debt Instrument, Face Amount | $ 1,500 |  |  | $ 1,500
Term Loan [Member] | Scenario, Forecast [Member] |  |  |  |
Debt Instrument, Term Loan [Line Items] |  |  |  |
Premium to Par Percentage, Prior to 3rd Anniversary |  |  | 4.25% |
Premium to Par Percentage Prior to 4th Anniversary |  | 2.125% |  |
Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument, Term Loan [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 7.50% |  |  |
Debt Instrument, Floor Rate | 1.00% |  |  |
Term Loan [Member] | Alternative Base Rate (ABR) [Member] |  |  |  |
Debt Instrument, Term Loan [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 6.50% |  |  |
Debt Instrument, Floor Rate | 2.00% |  |  |

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + 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 Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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