Commitments (Tables)

12 Months Ended

Dec. 31, 2015

Commitments [Abstract]

Schedule of Future Minimum Lease Payments

The following summarizes future minimum lease payments under operating leases at December 31, 2015:

millions
2016	$	806
2017	604
2018	352
2019	228
2020	86
Later years	41
Total future minimum lease payments	$	2,117