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Interest expense - Cash and Payment-In-Kind Interest (Details) - USD ($) $ in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 01, 2018 | Dec. 31, 2018 | Jul. 01, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |
Cash and payment-in-kind interest |  | $ (237) | $ (37) | $ (338) | $ (440)
Secured Debt | Secured credit facilities and unsecured bonds |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Cash and payment-in-kind interest |  | (162) | (116) | (239) | (327)
Less: adequate protection payments |  | 0 | 104 | 0 | 0
Secured Debt | Senior secured notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Cash and payment-in-kind interest | $ (5) | (50) | 0 | (60) | (66)
Secured Debt | Credit facilities contained within variable interest entities |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Cash and payment-in-kind interest |  | $ (25) | $ (25) | $ (39) | $ (47)

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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + 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 (b) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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