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Debt and Capital Lease Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Debt Instruments |  |
Net unamortized discount, including fair value adjustments | $ (24) | $ (21)
Total debt | 7,292 | 6,354
Capital lease obligations, including unamortized fair value adjustments | 85 | 32
Total debt and capital lease obligations | 7,377 | 6,386
Less current portion | (127) | (606)
Debt and capital lease obligations, less current portion | 7,250 | 5,780
Bank Credit Facilities [Member] | Credit Facilities [Member] |  |
Debt Instruments |  |
Long-term debt at stated values | $ 175 | 0
Senior Notes Due in 2025 [Member] | Senior Notes [Member] |  |
Debt Instruments |  |
Interest rate of notes in percentage | 3.65% |
Long-term debt at stated values | $ 600 | 0
Senior Notes Due In 2015 [Member] | Senior Notes [Member] |  |
Debt Instruments |  |
Interest rate of notes in percentage | 4.50% |
Long-term debt at stated values | $ 0 | 400
Senior Notes Due in 2045 [Member] | Senior Notes [Member] |  |
Debt Instruments |  |
Interest rate of notes in percentage | 4.90% |
Long-term debt at stated values | $ 650 | 0
Senior Notes Due In June 2017 [Member] | Senior Notes [Member] |  |
Debt Instruments |  |
Interest rate of notes in percentage | 6.125% |
Long-term debt at stated values | $ 750 | 750
Senior Notes Due In 2020 [Member] | Senior Notes [Member] |  |
Debt Instruments |  |
Interest rate of notes in percentage | 6.125% |
Long-term debt at stated values | $ 850 | 850
Senior Notes Due In June 2037 [Member] | Senior Notes [Member] |  |
Debt Instruments |  |
Interest rate of notes in percentage | 6.625% |
Long-term debt at stated values | $ 1,500 | 1,500
Senior Notes Due In October 2037 [Member] | Senior Notes [Member] |  |
Debt Instruments |  |
Interest rate of notes in percentage | 6.75% |
Long-term debt at stated values | $ 24 | 24
Senior Notes Due In October 2017 [Member] | Senior Notes [Member] |  |
Debt Instruments |  |
Interest rate of notes in percentage | 7.20% |
Long-term debt at stated values | $ 200 | 200
Senior Notes Due In 2097 [Member] | Senior Notes [Member] |  |
Debt Instruments |  |
Interest rate of notes in percentage | 7.45% |
Long-term debt at stated values | $ 100 | 100
Senior Notes Due In 2032 [Member] | Senior Notes [Member] |  |
Debt Instruments |  |
Interest rate of notes in percentage | 7.50% |
Long-term debt at stated values | $ 750 | 750
Senior Notes Due In 2030 [Member] | Senior Notes [Member] |  |
Debt Instruments |  |
Interest rate of notes in percentage | 8.75% |
Long-term debt at stated values | $ 200 | 200
Senior Notes Due In 2019 [Member] | Senior Notes [Member] |  |
Debt Instruments |  |
Interest rate of notes in percentage | 9.375% |
Long-term debt at stated values | $ 750 | 750
Senior Notes Due In 2039 [Member] | Senior Notes [Member] |  |
Debt Instruments |  |
Interest rate of notes in percentage | 10.50% |
Long-term debt at stated values | $ 250 | 250
Debenture Due In 2026 [Member] | Debentures [Member] |  |
Debt Instruments |  |
Interest rate of notes in percentage | 7.65% |
Long-term debt at stated values | $ 100 | 100
Debenture Due In 2015 [Member] | Debentures [Member] |  |
Debt Instruments |  |
Interest rate of notes in percentage | 8.75% |
Long-term debt at stated values | $ 0 | 75
Gulf Opportunity Zone Revenue Bonds Series 2010 [Member] | Revenue Bonds [Member] |  |
Debt Instruments |  |
Interest rate of notes in percentage | 4.00% |
Long-term debt at stated values | $ 300 | 300
A/R Sales Facility [Member] | Credit Facilities [Member] |  |
Debt Instruments |  |
Long-term debt at stated values | 100 | 100
Other Debt [Member] | Debentures [Member] |  |
Debt Instruments |  |
Long-term debt at stated values | $ 17 | $ 26

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 + Details
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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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 + Details
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- Definition Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + 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 The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28567-108399 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=6451184&loc=d3e28541-108399 Reference 3: 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=34725769&loc=d3e28878-108400 Reference 4: 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=6451184&loc=d3e28551-108399 Reference 5: 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=6451184&loc=d3e28555-108399 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: 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 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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