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Debt (Details) - USD ($) |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 13, 2019 | Apr. 16, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Mar. 28, 2013
Debt |  |  |  |  |  |
Repayments of notes payable |  |  | $ 0 | $ 114,000,000 |  |
Estimate of Fair Value Measurement |  |  |  |  |  |
Debt |  |  |  |  |  |
Estimated market value of long-term and short-term debt |  |  | 3,200,000,000 |  | $ 3,000,000,000.0 |
Carrying Value Reported Value Measurement |  |  |  |  |  |
Debt |  |  |  |  |  |
Aggregate carrying value of long-term and short-term debt |  |  | 3,000,000,000.0 |  | $ 3,000,000,000 |
6.625% Notes and Debentures Due April 15, 2018 |  |  |  |  |  |
Debt |  |  |  |  |  |
Repayments of notes payable |  | $ 114,000,000 |  |  |  |
Interest rate, stated percentage |  | 6.625% |  |  |  |
Credit Agreement dated March 13, 2019 |  |  |  |  |  |
Debt |  |  |  |  |  |
Borrowing capacity, maximum | $ 1,000,000,000.0 |  |  |  |  |
Increase in maximum borrowing capacity | $ 500,000,000 |  |  |  |  |
Maximum net leverage ratio | 4.0 |  |  |  |  |
Minimum interest coverage ratio | 2.5 |  |  |  |  |
Borrowings outstanding |  |  | 0 |  |  |
Credit Agreement dated March 13, 2019 | Federal funds effective rate |  |  |  |  |  |
Debt |  |  |  |  |  |
Interest rate, basis spread (as a percent) | 0.50% |  |  |  |  |
Credit Agreement dated March 13, 2019 | Libor rate |  |  |  |  |  |
Debt |  |  |  |  |  |
Interest rate, basis spread (as a percent) | 1.00% |  |  |  |  |
Credit Agreement dated March 13, 2019 | Revolver |  |  |  |  |  |
Debt |  |  |  |  |  |
Borrowing capacity, maximum | $ 500,000,000 |  |  |  |  |
Credit Agreement dated March 13, 2019 | Swingline loans |  |  |  |  |  |
Debt |  |  |  |  |  |
Borrowing capacity, maximum | 100,000,000 |  |  |  |  |
Credit Agreement dated March 13, 2019 | Letters of credit |  |  |  |  |  |
Debt |  |  |  |  |  |
Borrowing capacity, maximum | $ 25,000,000 |  |  |  |  |
Outstanding and unused Letters of Credit |  |  | $ 0 |  |  |
Credit Agreement dated March 28, 2013 |  |  |  |  |  |
Debt |  |  |  |  |  |
Borrowing capacity, maximum |  |  |  |  |  | $ 750,000,000

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- Definition Increase in maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References No definition available. + Details
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Represents the aggregate of total long-term debt, including current maturities and short-term debt. + References No definition available. + Details
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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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