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Long-Term Debt (5.500% Senior Notes Due 2020) (Details) - Senior Notes [Member] - USD ($) | Mar. 31, 2018 | Jan. 23, 2018 | Dec. 31, 2017 | Apr. 07, 2016 | Jul. 20, 2015
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount |  |  | $ 2,200,000,000.0 |  |  |
Six Point Two Five Zero Percentage Senior Notes Due Two Thousand Twenty One [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior Notes | [1] | $ 0 |  | $ 800,000,000 |  |
Face amount |  |  |  |  | $ 800,000,000 |
Senior Notes Call Premium |  |  | 32,000,000 |  |  |
Interest rate, stated percentage |  |  |  |  | 6.25% |
Five Point Five Zero Zero Percentage Senior Notes Due Two Thousand Twenty [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior Notes | [1] | $ 0 |  | $ 600,000,000 |  |
Face amount |  |  |  |  |  | $ 600,000,000
Senior Notes Call Premium |  |  | $ 17,000,000 |  |  |
Interest rate, stated percentage |  |  |  |  |  | 5.50%
[1] | (2)The Senior Notes were redeemed 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 Contractual interest rate for funds borrowed, under the debt agreement. + 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)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: 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(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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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