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Financial instruments and risk management - Derivative Financial Instruments (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Outstanding principal | $ 4,939,000,000 |
Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative financial instruments | 0 | $ 3,000,000
Other Assets | Interest rate cap |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding principal | 4,500,000,000 |
Derivative financial instruments | $ 0 | $ 3,000,000

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- Definition Amount of hedged item in hedging relationship. Excludes hedged asset or liability. + References No definition available. + Details
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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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