Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2016

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Lease Payments for Capital and Operating Leases [Table Text Block]

Future minimum lease payments as of December 31, 2016, are summarized as follows (in millions):

December 31,	Capital Leases			Operating Leases		a
2017	$	77		$	523
2018	74			478
2019	71			449
2020	69			451
2021	200			376
Thereafter	164			1,158
Total	655			$	3,435
Less amount representing interest	(143		)
Present value of minimum lease payments	$	512

^a Excludes leases having non-cancelable lease terms of less than one year and per diem leases.

Schedule of Loss Contingencies by Contingency

The following table summarizes the activity in the Company’s accrued obligations for asbestos and other personal injury matters (in millions):

	Year Ended			Year Ended			Year Ended
	December 31, 2016			December 31, 2015			December 31, 2014
Beginning balance	$	375		$	375		$	387
Accruals	80			81			61
Payments	(88		)	(81		)	(73		)
Ending balance	$	367		$	375		$	375

Accrued Obligations for Environmental Matters

The following table summarizes the activity in the Company’s accrued obligations for environmental matters (in millions):

	Year Ended			Year Ended			Year Ended
	December 31, 2016			December 31, 2015			December 31, 2014
Beginning balance	$	369		$	404		$	435
Accruals	5			4			13
Payments	(32		)	(39		)	(44		)
Ending balance	$	342		$	369		$	404