Pensions Benefit Plans and Other Postretirement Benefits - Changes in Fair Value of Pension Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
U.S Pension Plans
Changes in fair value of pension plan assets
Fair value at beginning of year	$ 1,909	$ 2,190
Actual gain (loss) on plan assets	118	(32)
Benefit payments	(175)	(252)
Employer contributions	2	2
Settlements	(200)
Other		1
Net change in fair value of assets	(255)	(281)
Fair value at end of year	1,654	1,909
Non-U.S. Pension Plans
Changes in fair value of pension plan assets
Fair value at beginning of year	1,012	1,094
Actual gain (loss) on plan assets	139	42
Benefit payments	(71)	(58)
Employer contributions	38	15
Participant contributions	2	1
Acquisitions		22
Foreign currency translation	(111)	(104)
Other	2
Net change in fair value of assets	(1)	(82)
Fair value at end of year	$ 1,011	$ 1,012