Leased Assets (Tables)

12 Months Ended

Dec. 31, 2017

Leases [Abstract]

Future Minimum Rental Payments

  At December 31, 2017, future minimum rental payments applicable to non‑cancelable operating leases with remaining terms of one year or more (other than oil and gas property leases) are as follows (in millions):

2018	$	387
2019	376
2020	130
2021	71
2022	70
Remaining years	276
Total Minimum Lease Payments		1,310
Less: Income from subleases	99
Net Minimum Lease Payments	$	1,211

Rental Expense

Rental expense was as follows:

	2017		2016		2015
	(In millions)
Total rental expense	$	123	$	106	$	167
Less: Income from subleases	10		5		10
Net Rental Expense	$	113	$	101	$	157