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Debt (Term Loans under the Senior Credit Agreement) (Narrative) (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 01, 2019 | Apr. 11, 2018 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, principal balance |  |  |  | $ 10,028,000,000 | $ 9,405,000,000 |
Repayment of term loans |  |  |  | 1,947,000,000 | 20,000,000 | $ 20,000,000
2014 Term Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 1,500,000,000 |  |
Debt instrument, maturity date |  |  |  | Mar. 24, 2021 |  |
Percentage of par value price for issuance of term loan |  |  |  | 99.75% |  |
Quarterly payments |  |  |  | $ 3,800,000 |  |
Debt instrument, principal balance |  |  |  |  | 1,447,500,000 |
Financing fees |  |  |  | 14,100,000 |  |
Repayment of term loans |  | $ 1,443,800,000 | $ 3,800,000 |  |  |
Write-off of deferred financing fees |  | 5,800,000 |  |  |  |
Discount related to debt |  | 1,700,000 |  |  |  |
2015 Term Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 500,000,000 |  |
Debt instrument, maturity date |  |  |  | Jun. 10, 2022 |  |
Percentage of par value price for issuance of term loan |  |  |  | 99.00% |  |
Quarterly payments |  |  |  | $ 1,300,000 |  |
Debt instrument, principal balance |  |  |  |  | $ 487,500,000 |
Financing fees |  |  |  | $ 5,500,000 |  |
Repayment of term loans |  | 486,300,000 | $ 1,300,000 |  |  |
Write-off of deferred financing fees |  | 3,200,000 |  |  |  |
Discount related to debt |  | 3,100,000 |  |  |  |
2018 Term Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  | $ 2,400,000,000 |  |  |  |
Debt instrument, maturity date |  | Apr. 11, 2025 |  | Apr. 11, 2025 |  |
Percentage of par value price for issuance of term loan |  | 99.75% |  |  |  |
Quarterly payments |  |  |  | $ 6,000,000 |  |
Accruing interest rate during the period |  |  |  | 4.53% |  |
Debt instrument, principal balance |  |  |  | $ 2,388,000,000 |  |
Financing fees |  | $ 16,800,000 |  |  |  |
Repayment of term loans |  |  |  | $ 12,000,000 |  |
2014 and 2015 Term Loans [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayment of term loans |  | $ 1,930,000,000 |  |  |  |
Base Rate [Member] | 2014 Term Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable interest rate |  |  |  | 1.25% |  |
Rate floor |  |  |  | 0.00% |  |
Base Rate [Member] | 2015 Term Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable interest rate |  |  |  | 1.25% |  |
Rate floor |  |  |  | 0.00% |  |
Base Rate [Member] | 2018 Term Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable interest rate |  | 1.00% |  |  |  |
Rate floor |  | 0.00% |  |  |  |
Eurodollar [Member] | 2014 Term Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable interest rate |  |  |  | 2.25% |  |
Rate floor |  |  |  | 0.00% |  |
Eurodollar [Member] | 2015 Term Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable interest rate |  |  |  | 2.25% |  |
Rate floor |  |  |  | 0.00% |  |
Eurodollar [Member] | 2018 Term Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable interest rate |  | 2.00% |  |  |  |
Rate floor |  | 0.00% |  |  |  |
Subsequent Event [Member] | 2018 Term Loan [Member] | Interest Rate Swap [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Accruing interest rate during the period | 4.495% |  |  |  |  |
Loan period | 4 years |  |  |  |  |
Notional amount | $ 1,200,000,000 |  |  |  |  |
Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member] | 2018 Term Loan [Member] | Interest Rate Swap [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable interest rate | 2.00% |  |  |  |  |

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The average effective interest rate during the reporting period. + References Reference 1: 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 Reference 2: 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 Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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- Definition Floor rate on an interest rate derivative such as an interest rate floor or collar. If market rates falls below the floor rate, a payment or receipt is triggered on the contract. + References No definition available. + Details
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- Definition Amount of cash outflow for the payment of debt classified as other, maturing after one year or the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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