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Commitments And Contingent Liabilities (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]
At December 31, 2017, total future minimum commitments under existing non-cancelable operating leases were as follows: 
In millions
2018
2019
2020
2021
2022
Thereafter
Lease obligations
$
130

$
102

$
77

$
53

$
37

$
141