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Debt - Schedule of Debt Issuance Costs Against Current and Long-Term Debt (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Principal outstanding |  |
Principal outstanding, current portion of long-term debt | $ 91 | $ 511
Principal outstanding, noncurrent portion | 856 | 485
Debt held as subject to compromise | 7,600 | 7,705
Total | 8,547 | 8,701
Debt issuance costs |  |
Debt issuance costs, current portion of long-term debt | (1) | (2)
Debt issuance costs, noncurrent portion | 0 | 0
Debt issuance costs, Debt held as subject to compromise | 0 | 0
Debt issuance costs, gross | (1) | (2)
Total debt |  |
Total debt, current portion | 90 | 509
Total debt, noncurrent portion | 856 | 485
Total debt, Debt held as subject to compromise | 7,600 | 7,705
Total | $ 8,546 | $ 8,699

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- Definition Amount, before accumulated amortization, of debt issuance costs classified as current. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: 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=64930785&loc=d3e28555-108399 + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + 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 210.5-02.17) -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 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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