Postretirement Benefit Plans (Summary of Amounts Recognized in Financial Statements) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Change in benefit obligation:
Benefit obligation at beginning of year	$ 840
Benefit obligation at end of year	918	$ 840
Change in plan assets:
Beginning Balance	559
Ending Balance	562	559
Unfunded status of the plans	(356)	(281)
Domestic defined benefit pension plans
Change in benefit obligation:
Benefit obligation at beginning of year	86	88
Service cost	3	3	$ 2
Interest cost	4	4	3
Benefits paid	(4)	(4)
Actuarial loss (gain)	(2)	(5)
Plan amendments, settlements and curtailments	(1)	1
Acquisitions	13	0
Foreign currency translation/Other	1	(1)
Benefit obligation at end of year	100	86	88
Change in plan assets:
Beginning Balance	57	60
Employer contributions	4	3
Actual return on plan assets	4	(2)
Benefits paid	(4)	(4)
Acquisitions	9	0
Foreign currency translation/Other	(1)	0
Ending Balance	69	57	60
Unfunded status of the plans	(31)	(29)
International defined benefit pension plans
Change in benefit obligation:
Benefit obligation at beginning of year	693	784
Service cost	10	12	12
Interest cost	21	22	27
Benefits paid	(26)	(29)
Actuarial loss (gain)	52	(39)
Plan amendments, settlements and curtailments	(1)	(1)
Acquisitions	83	0
Foreign currency translation/Other	(78)	(56)
Benefit obligation at end of year	754	693	784
Change in plan assets:
Beginning Balance	502	524
Employer contributions	20	19
Actual return on plan assets	64	22
Benefits paid	(26)	(29)
Acquisitions	0	0
Foreign currency translation/Other	(67)	(34)
Ending Balance	493	502	$ 524
Unfunded status of the plans	$ (261)	$ (191)