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Financial Instruments and Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Schedule of fair value, assets and liabilities measured on recurring basis
The Company's assets and liabilities measured or disclosed at fair value were as follows:
Fair value measurements at September 30, 2021 using
(in millions)TotalQuoted prices
in active
markets for
identical
assets
(Level 1)
Significant
other
observable
inputs
(Level 2)
Significant
unobservable
inputs
(Level 3)
Current assets:
    Cash equivalents$150 150 — — 
    Financial instrument asset (note 5)
92 — 92 — 
Current liabilities:
     Debt (note 5)549 — 549 — 
     Interest rate swap arrangements (note 5)— — 
Long-term liabilities:
Debt (note 5)4,699 749 3,950 — 
Fair value measurements at December 31, 2020 using
(in millions)TotalQuoted prices
in active
markets for
identical
assets
(Level 1)
Significant
other
observable
inputs
(Level 2)
Significant
unobservable
inputs
(Level 3)
Current assets:
Cash equivalents$240 240 — — 
Financial instrument asset (note 5)
23 23 — 
Current liabilities:
Debt (note 5)393 — 393 — 
Long-term liabilities:
Debt (note 5)4,705 743 3,962 — 
 Interest rate swap arrangements (note 5)— —