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LONG-TERM DEBT - SCHEDULE (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
LONG-TERM DEBT |  |  |
Long-term debt, gross | $ 10,407 |  | $ 9,907
Unamortized discount, net | (36) |  | (32)
Debt issuance costs | (54) |  | (47)
Current maturities | (116) |  | (500)
Total | $ 10,201 |  | 9,328
9.25% senior debentures due 2019 |  |  |
LONG-TERM DEBT |  |  |
Debt instrument interest rate stated percentage | 9.25% |  |
Long-term debt, gross | $ 116 |  | 116
4.10% senior notes due 2021 |  |  |
LONG-TERM DEBT |  |  |
Debt instrument interest rate stated percentage | 4.10% |  |
Long-term debt, gross | $ 1,249 |  | 1,249
3.125% senior notes due 2022 |  |  |
LONG-TERM DEBT |  |  |
Debt instrument interest rate stated percentage | 3.125% |  |
Long-term debt, gross | $ 813 |  | 813
2.60% senior notes due 2022 |  |  |
LONG-TERM DEBT |  |  |
Debt instrument interest rate stated percentage | 2.60% |  |
Long-term debt, gross | $ 400 |  | 400
2.70% senior notes due 2023 |  |  |
LONG-TERM DEBT |  |  |
Debt instrument interest rate stated percentage | 2.70% |  |
Long-term debt, gross | $ 1,191 |  | 1,191
8.75% medium-term notes due 2023 |  |  |
LONG-TERM DEBT |  |  |
Debt instrument interest rate stated percentage | 8.75% |  |
Long-term debt, gross | $ 22 |  | 22
3.50% senior notes due 2025 |  |  |
LONG-TERM DEBT |  |  |
Debt instrument interest rate stated percentage | 3.50% |  |
Long-term debt, gross | $ 750 |  | 750
3.40% senior notes due 2026 |  |  |
LONG-TERM DEBT |  |  |
Debt instrument interest rate stated percentage | 3.40% |  |
Long-term debt, gross | $ 1,150 |  | 1,150
3.00% senior notes due 2027 |  |  |
LONG-TERM DEBT |  |  |
Debt instrument interest rate stated percentage | 3.00% |  |
Long-term debt, gross | $ 750 |  | 750
7.20% senior debentures due 2028 |  |  |
LONG-TERM DEBT |  |  |
Debt instrument interest rate stated percentage | 7.20% |  |
Long-term debt, gross | $ 82 |  | 82
8.45% senior debentures due 2029 |  |  |
LONG-TERM DEBT |  |  |
Debt instrument interest rate stated percentage | 8.45% |  |
Long-term debt, gross | $ 116 |  | 116
4.625% senior notes due 2045 |  |  |
LONG-TERM DEBT |  |  |
Debt instrument interest rate stated percentage | 4.625% |  |
Long-term debt, gross | $ 750 |  | 750
4.40% senior notes due 2046 |  |  |
LONG-TERM DEBT |  |  |
Debt instrument interest rate stated percentage | 4.40% |  |
Long-term debt, gross | $ 1,200 |  | 1,200
4.10% senior notes due 2047 |  |  |
LONG-TERM DEBT |  |  |
Debt instrument interest rate stated percentage | 4.10% |  |
Long-term debt, gross | $ 750 |  | 750
4.20% senior notes due 2048 |  |  |
LONG-TERM DEBT |  |  |
Debt instrument interest rate stated percentage | 4.20% |  |
Long-term debt, gross | $ 1,000 |  | 0
1.50% senior notes due 2018 |  |  |
LONG-TERM DEBT |  |  |
Debt instrument interest rate stated percentage | 1.50% | 1.50% |
Long-term debt, gross | $ 0 |  | $ 500
Variable rate bonds due 2030 |  |  |
LONG-TERM DEBT |  |  |
Variable interest rate | 1.90% |  | 1.80%
Long-term debt, gross | $ 68 |  | $ 68

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: 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 Reference 3: 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 4: 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 + Details
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