Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Future Minimum Lease Payments

Future minimum lease payments under non-cancelable leases for the years ending December 31 are as follows:

In millions
2018	$	88
2019	63
2020	45
2021	31
2022	25
2023 and future years	61
Total future minimum lease payments	$	313