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Financial instruments and risk management - Interest Rate Risk (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Apr. 10, 2019
Debt Instrument [Line Items] |  |  |
Principal outstanding | $ 4,939 |  |
Hedging instruments | 0 |  |
Net exposure | 4,939 |  |
Impact of 1% increase in rates | 50 |  |
Total debt principal | 6,177 | $ 6,759 |
Total floating rate debt obligations |  |  |
Debt Instrument [Line Items] |  |  |
Principal outstanding | 5,662 |  |
Hedging instruments | 0 |  |
Net exposure | 5,662 |  |
Impact of 1% increase in rates | 57 |  |
Total floating rate debt obligations | Senior Credit Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Principal outstanding | 5,662 |  |
Hedging instruments | (4,500) |  |
Net exposure | 1,162 |  |
Impact of 1% increase in rates | 12 |  |
Total floating rate debt obligations | Ineffective portion of interest rate cap |  |  |
Debt Instrument [Line Items] |  |  |
Principal outstanding | 0 |  |
Hedging instruments | 4,500 |  |
Net exposure | 4,500 |  |
Impact of 1% increase in rates | $ 45 |  |
Impact that would be mitigated (as a percent) | 0.00% |  |
Hypothetical increase in rates (as a percent) | 1.00% |  |
Less: Cash and Restricted Cash |  |  |
Debt Instrument [Line Items] |  |  |
Principal outstanding | $ (723) |  |
Hedging instruments | 0 |  |
Net exposure | (723) |  |
Impact of 1% increase in rates | (7) |  |
Secured Debt | Senior secured notes |  |  |
Debt Instrument [Line Items] |  |  |
Total debt principal | $ 515 | $ 476 | $ 476

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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=120520924&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=120400017&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=120391452&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=120398452&loc=d3e534808-122878 + Details
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