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Debt - Long-Term Debt Table (Details) - USD ($) |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 29, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
Long-Term Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  | $ 9,862,000,000 | $ 9,981,000,000 |
Long-term Debt, Gross |  | 9,812,000,000 | 9,973,000,000 |
Debt issuance costs |  | (54,000,000) | (63,000,000) |
Debt, current |  | (433,000,000) | (53,000,000) |
Current maturities of long-term debt, net |  | (432,000,000) | (52,000,000) |
Long-term debt, fair value |  | 9,429,000,000 | 9,928,000,000 |
Long-term debt, net |  | 9,380,000,000 | 9,921,000,000 |
Interest rate contract [Member] |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  | 0 | 0 |
Interest rate derivatives |  | $ 1,000,000 | 2,000,000 |
Senior notes [Member] |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |
Debt redemption, percent of principal amount of notes to be redeemed |  | 100.00% |  |
Senior notes [Member] | 7.25% Senior Notes Due 2018 [Member] |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  | $ 44,000,000 | 44,000,000 |
Long-term Debt, Gross |  | $ 44,000,000 | 44,000,000 |
Interest rate, stated percentage |  | 7.25% |  |
Senior notes [Member] | Floating Rate Senior Notes Due 2019 [Member] |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  | $ 380,000,000 | 380,000,000 |
Long-term Debt, Gross |  | 380,000,000 | 380,000,000 |
Senior notes [Member] | 6.625% Senior Notes Due 2020 [Member] |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  | 437,000,000 | 437,000,000 |
Long-term Debt, Gross |  | $ 437,000,000 | 437,000,000 |
Interest rate, stated percentage |  | 6.625% |  |
Senior notes [Member] | 6.875% Senior Notes Due 2020 [Member] |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  | $ 227,000,000 | 227,000,000 |
Long-term Debt, Gross |  | $ 227,000,000 | 227,000,000 |
Interest rate, stated percentage |  | 6.875% |  |
Senior notes [Member] | 6.125% Senior Notes Due 2021 [Member] |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  | $ 548,000,000 | 548,000,000 |
Long-term Debt, Gross |  | $ 548,000,000 | 548,000,000 |
Interest rate, stated percentage |  | 6.125% |  |
Senior notes [Member] | 5.375% Senior Notes Due 2021 [Member] |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  | $ 267,000,000 | 267,000,000 |
Long-term Debt, Gross |  | $ 267,000,000 | 267,000,000 |
Interest rate, stated percentage |  | 5.375% |  |
Senior notes [Member] | 4.875% Senior Notes Due 2022 [Member] |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  | $ 451,000,000 | 451,000,000 |
Long-term Debt, Gross |  | $ 451,000,000 | 451,000,000 |
Interest rate, stated percentage |  | 4.875% |  |
Senior notes [Member] | 8.00% Senior Secured Second Lien Notes Due 2022 [Member] |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  | $ 1,416,000,000 | 1,416,000,000 |
Long-term Debt, Gross |  | $ 1,823,000,000 | 1,895,000,000 |
Interest rate, stated percentage |  | 8.00% |  | 8.00%
Senior notes [Member] | 5.75% Senior Notes Due 2023 [Member] |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  | $ 338,000,000 | 338,000,000 |
Long-term Debt, Gross |  | $ 338,000,000 | 338,000,000 |
Interest rate, stated percentage |  | 5.75% |  |
Senior notes [Member] | 7.00% senior notes due 2024 [Member] |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  | $ 850,000,000 | 0 |
Long-term Debt, Gross |  | $ 850,000,000 | 0 |
Interest rate, stated percentage |  | 7.00% |  |
Senior notes [Member] | 8.00% Senior Notes Due 2025 [Member] |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  | $ 1,300,000,000 | 1,300,000,000 |
Long-term Debt, Gross |  | $ 1,290,000,000 | 1,290,000,000 |
Interest rate, stated percentage |  | 8.00% |  |
Senior notes [Member] | 8.00% Senior Notes Due 2027 [Member] |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  | $ 1,300,000,000 | 1,300,000,000 |
Long-term Debt, Gross |  | $ 1,298,000,000 | 1,298,000,000 |
Interest rate, stated percentage |  | 8.00% |  |
Convertible debt [Member] | 5.5% Convertible Senior Notes Due 2026 [Member] |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  | $ 1,250,000,000 | 1,250,000,000 |
Long-term Debt, Gross |  | $ 859,000,000 | 837,000,000 |
Interest rate, stated percentage |  | 5.50% |  |
Interest rate, effective percentage |  | 11.50% |  |
Convertible debt [Member] | 7.5% senior notes due 2026 [Member] |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  | $ 400,000,000 | 0 |
Long-term Debt, Gross |  | $ 400,000,000 | 0 |
Interest rate, stated percentage |  | 7.50% |  |
Convertible debt [Member] | 2.25% Contingent Convertible Senior Notes Due 2038 [Member] |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  | $ 9,000,000 | 9,000,000 |
Long-term Debt, Gross |  | $ 8,000,000 | 8,000,000 |
Interest rate, stated percentage |  | 2.25% |  |
Interest rate, effective percentage |  | 8.00% |  |
Term loan [Member] |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  | $ 0 | 1,233,000,000 |
Long-term Debt, Gross |  | 0 | 1,233,000,000 |
Debt issuance costs |  | (13,000,000) |  |
Line of Credit [Member] | Revolving credit facility [Member] |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  | 645,000,000 | 781,000,000 |
Revolving credit facility |  | $ 645,000,000 | $ 781,000,000 |
Subsequent Event [Member] | Senior notes [Member] | 8.00% Senior Secured Second Lien Notes Due 2022 [Member] |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |
Debt redemption, percent of principal amount of notes to be redeemed | 100.00% |  |  |

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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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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: 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 2: 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 Reference 3: 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 + Details
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