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Leases (Tables)
 3 Months Ended
Mar. 31, 2020
Leases [Abstract]  
Lease, Cost [Table Text Block]
Supplemental information for operating leases is as follows:
(MILLIONS OF DOLLARS, EXCEPT LEASE TERM AND DISCOUNT RATE AMOUNTS)As of March 31, 2020As of December 31, 2019
Supplemental Balance Sheet information for operating leases
Operating lease right of use assets$182  $189  
Operating lease liabilities
Operating lease liabilities - current (in Other current liabilities)
$33  $35  
Operating lease liabilities - noncurrent159  164  
Total operating lease liabilities$192  $199  
Weighted-average remaining lease term—operating leases (years)7.057.12
Weighted-average discount rate—operating leases3.34 %3.76 %
Three Months Ended
(MILLIONS OF DOLLARS)March 31, 2020March 31, 2019
Supplemental Income Statement information for operating leases
Operating lease expense$11  $9  
Variable lease payments not included in the measurement of lease liabilities5  4  
Short-term lease payments not included in the measurement of lease liabilities2  3  
Supplemental Cash Flow information for operating leases
Cash paid for amounts included in the measurement of lease liabilities$11  $9  
Lease obligations obtained in exchange for right-of-use assets (non-cash)4  176  
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
Future minimum lease payments under non-cancellable operating lease contracts as of March 31, 2020 are as follows:
TotalLess:
AfterLeaseImputed
(MILLIONS OF DOLLARS)
2020(a)
20212022202320242024PaymentsInterestTotal
Maturities$31  $37  $33  $27  $23  $68  $219  $(27) $192  
(a) 2020 excludes the three months ended March 31, 2020