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Long-Term Debt (Term Loan) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | [1] | Dec. 31, 2017 | Mar. 31, 2016
--- | --- | --- | --- | ---
Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term Loan (1) | [1] |  | $ 1,243 |
Medium-term Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term Loan (1) |  | $ 0 |  | $ 2,035
[1] | (1)The Term Loan was repaid in full and terminated on January 23, 2018.

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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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- Details
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- Details
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Period Type: |