Benefit Plans (Obligations and Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
U.S. Plans - Pension [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at January 1,	$ 389	$ 438
Service cost	5	5	$ 5
Interest cost	17	17	17
Benefits paid	(18)	(51)
Settlement and curtailment	0	0
Actuarial losses (gains)	12	(20)
Currency	0	0
Other	0	0
Benefit obligation at December 31,	405	389	438
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at January 1,	298	312
Actual return on plan assets	13	0
Employer contributions	4	37
Employee contributions	0	0
Benefits paid	(18)	(51)
Settlement and curtailment	0	0
Currency	0	0
Fair value of plan assets at December 31,	297	298	312
Net benefit liability	(108)	(91)
Non-U.S. Plans - Pension [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at January 1,	7,697	7,638
Service cost	202	200	211
Interest cost	129	139	205
Benefits paid	(222)	(225)
Settlement and curtailment	(1)	(16)
Actuarial losses (gains)	415	261
Currency	(329)	(365)
Other	91	65
Benefit obligation at December 31,	7,982	7,697	7,638
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at January 1,	6,106	6,410
Actual return on plan assets	309	56
Employer contributions	187	117
Employee contributions	39	37
Benefits paid	(222)	(225)
Settlement and curtailment	0	(14)
Currency	(259)	(275)
Fair value of plan assets at December 31,	6,160	6,106	6,410
Net benefit liability	(1,822)	(1,591)
Postretirement [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at January 1,	211	238
Service cost	3	4	4
Interest cost	9	9	10
Benefits paid	(10)	(11)
Settlement and curtailment	0	0
Actuarial losses (gains)	15	(12)
Currency	(2)	(17)
Other	1	0
Benefit obligation at December 31,	227	211	$ 238
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Benefits paid	(10)	(11)
Net benefit liability	$ (227)	$ (211)