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Contingencies and commitments (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Minimum future rental commitments under non-cancelable operating leases
The following table summarizes the minimum future rental commitments under noncancelable operating leases as of December 31, 2018 (in millions):
 
Amounts
2019
$
164

2020
126

2021
113

2022
64

2023
56

Thereafter
46

Total minimum operating lease commitments
$
569

U.S. repatriation tax commitments
Under the 2017 Tax Act, we elected to pay the repatriation tax related primarily to our prior indefinitely invested earnings of our foreign operations in eight annual installments. See Note 7, Income taxes. The following table summarizes the remaining scheduled repatriation tax payments as of December 31, 2018 (in millions):
 
Amounts
2019
$
586

2020
586

2021
586

2022
586

2023
1,099

Thereafter
3,296

Total remaining U.S. repatriation tax commitments
$
6,739