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Commitments and Contingent Liabilities (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
The table below depicts future gross minimum rental commitments under our operating leases and rights-of-way obligations as of December 31, 2018 (in millions):
Year
 
Commitment
2019
 
$
122

2020
 
107

2021
 
102

2022
 
97

2023
 
81

Thereafter
 
353

Total minimum payments
 
$
862