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Debt - Schedule of Debt (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Fair value of interest rate swap agreements | $ (61,000,000) | $ (95,000,000)
Total senior notes | 6,344,000,000 | 6,310,000,000
Mortgage notes payable | 57,000,000 | 57,000,000
Construction loan payable | 78,000,000 | 63,000,000
Finance leases and other | 49,000,000 | 47,000,000
Debt issuance costs | (70,000,000) | (75,000,000)
Total debt | 6,815,000,000 | 6,686,000,000
Less current portion | (40,000,000) | (38,000,000)
Long-term debt | 6,775,000,000 | 6,648,000,000
Revolving credit agreement |  |
Debt Instrument [Line Items] |  |
Revolving credit agreement | 357,000,000 | 284,000,000
Senior Notes | $1,400 million 5.625% Senior notes, due February 15, 2021 |  |
Debt Instrument [Line Items] |  |
Debt, face amount | $ 1,400,000,000 |
Interest rate | 5.625% |
Senior notes | $ 1,400,000,000 | 1,400,000,000
Senior Notes | $1,000 million 4.75% Senior notes, due May 15, 2022 |  |
Debt Instrument [Line Items] |  |
Debt, face amount | $ 1,000,000,000 |
Interest rate | 4.75% |
Senior notes | $ 1,005,000,000 | 1,005,000,000
Senior Notes | $1,000 million 6.125% Senior notes, due February 15, 2024 |  |
Debt Instrument [Line Items] |  |
Debt, face amount | $ 1,000,000,000 |
Interest rate | 6.125% |
Senior notes | $ 1,000,000,000 | 1,000,000,000
Senior Notes | $1,200 million 4.75% Senior notes, due January 15, 2025 |  |
Debt Instrument [Line Items] |  |
Debt, face amount | $ 1,200,000,000 |
Interest rate | 4.75% |
Senior notes | $ 1,200,000,000 | 1,200,000,000
Senior Notes | $1,800 million 5.375% Senior notes, due June 1, 2026 |  |
Debt Instrument [Line Items] |  |
Debt, face amount | $ 1,800,000,000 |
Interest rate | 5.375% |
Senior notes | $ 1,800,000,000 | $ 1,800,000,000

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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