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DEBT - Notes and Debentures (Details) - USD ($) |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 27, 2017 | Jun. 21, 2017 | Mar. 17, 2016 | Jun. 15, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Apr. 15, 2016 | Mar. 24, 2015 | Dec. 31, 2012
Debt |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  | $ 599,000,000 | $ 896,000,000 |  |  |  |  |  |  |
Repayments of notes payable |  |  |  |  | $ 535,000,000 | $ 1,300,000,000 | $ 500,000,000 |  |  |
Debt extinguishment costs |  |  |  |  | 104,000,000 | 40,000,000 | 0 |  |  |
Debt extinguishment costs |  |  |  |  | $ 104,000,000 | 40,000,000 | $ 0 |  |  |
Debt issued |  |  |  |  |  |  |  |  |  | $ 400,000,000
6.625% Notes and Debentures Due 15 April 2018 | Senior notes and debentures |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 6.625% |  |  |  |  |
Senior Notes |  |  |  |  | $ 114,000,000 | $ 114,000,000 |  |  |  |
7.75% Notes and Debentures Due 1 August 2029 | Senior notes and debentures |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 7.75% |  |  |  | 7.75% | 7.75% |  |  |  |
Repayments of notes payable | $ 62,000,000 |  |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  | $ 234,000,000 | $ 296,000,000 |  |  |  |
3.5% Notes and Debentures Due November 15, 2027 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 3.50% |  |  |  |  |
3.5% Notes and Debentures Due November 15, 2027 | Senior notes and debentures |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 3.50% |  |  |  |  |  |  |  |
Long-term debt, gross |  | $ 300,000,000 |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  | $ 300,000,000 | 0 |  |  |  |
4.5% Notes and Debentures Due May 15, 2047 | Senior notes and debentures |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 4.50% |  |  | 4.50% |  |  |  |  |
Long-term debt, gross |  | $ 300,000,000 |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  | $ 299,000,000 | 0 |  |  |  |
7.125% Notes and Debentures Due 15 March 2020 | Senior notes and debentures |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 7.125% |  |  |  | 7.125% |  |  |  |  |
Repayments of notes payable | $ 299,000,000 |  |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  | $ 201,000,000 | 500,000,000 |  |  |  |
5.95% Notes and Debentures Due March 15, 2022 [Member] | Senior notes and debentures |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 5.95% |  |  |  |  |  |  |  |  |
Repayments of notes payable | $ 74,000,000 |  |  |  |  |  |  |  |  |
6.5% Notes and Debentures Due 15 August 2032 | Senior notes and debentures |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 6.50% |  |  |  | 6.50% |  |  |  |  |
Repayments of notes payable | $ 100,000,000 |  |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  | $ 200,000,000 | 300,000,000 |  |  |  |
7.125%, 5.95%, 7.75% and 6.5% Notes and Debentures [Member] |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt extinguishment costs |  |  |  |  | $ 107,000,000 |  |  |  |  |
3.5% Notes and Debentures Due April 1, 2021 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 3.50% |  |  |  |  |
3.5% Notes and Debentures Due April 1, 2021 | Senior notes and debentures |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 3.50% |  |  |  |  |  |  |
Long-term debt, gross |  |  | $ 400,000,000 |  |  |  |  |  |  |
Senior Notes |  |  |  |  | $ 399,000,000 | 399,000,000 |  |  |  |
4.375% Notes and Debentures Due April 1, 2026 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 4.375% |  |  |  |  |
4.375% Notes and Debentures Due April 1, 2026 | Senior notes and debentures |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 4.375% |  |  |  |  |  |  |
Long-term debt, gross |  |  | $ 500,000,000 |  |  |  |  |  |  |
Senior Notes |  |  |  |  | $ 498,000,000 | 498,000,000 |  |  |  |
6.125% Notes and Debentures Due October 3, 2016 | Senior notes and debentures |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 6.125% |  |
Senior Notes |  |  |  |  |  |  |  | $ 1,000,000,000 |  |
5.85% Notes and Debenture Due March 15, 2017 | Senior notes and debentures |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 5.85% |  |
Senior Notes |  |  |  |  |  |  |  | $ 300,000,000 |  |
4.8% Notes and Debentures Due 15 June 2015 | Senior notes and debentures |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 4.80% |  |  |  |  |  |
Repayments of notes payable |  |  |  | $ 500,000,000 |  |  |  |  |  |
4.45% Notes and Debentures Due 1 April 2025 | Senior notes and debentures |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 4.45% |  |  |  | 4.45% |
Senior Notes |  |  |  |  | $ 500,000,000 | $ 500,000,000 |  |  |  |
Debt issued |  |  |  |  |  |  |  |  | $ 500,000,000 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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 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 3: 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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- 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 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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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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- Definition The cash outflow for incremental, external costs directly pertaining to an early extinguishment of debt, including legal costs and prepayment penalties, and excluding interest and repayment of debt principal. + References No definition available. + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References No definition available. + Details
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- Definition The cash outflow for a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 + 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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