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Other liabilities - Balance sheet presentation (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Other Liabilities [Abstract] |  |
Other current liabilities | $ 316 | $ 322
Other non-current liabilities | 120 | 128
Total Other Liabilities | $ 436 | $ 450

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- Definition Amount of liabilities classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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