Employee Retirement Benefits (Change in Benefit Obligation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
U.S. Plan
Change in Benefit Obligation [Roll Forward]
Benefit obligation at the beginning of the year	$ 671	$ 679
Service cost	28	27	$ 25
Interest cost	31	28	28
Plan amendments		(5)
Plan curtailments	(42)
Plan settlements	(11)
Benefits paid	(23)	(23)
Actuarial loss (gain)	72	(35)
Benefit obligation at the end of the year	726	671	679
Change in Plan Assets [Roll Forward]
Fair value of plan assets at the beginning of the year	563	498
Actual return of plan assets	55	68
Company contributions	35	20
Plan settlements	(11)
Benefits paid	(23)	(23)
Fair value of plan assets at the end of the year	619	563	498
Defined Benefit Plan, Funded Status of Plan [Abstract]
Plan assets less than benefit obligation	(107)	(108)
Pension Benefits - Non-U.S.
Change in Benefit Obligation [Roll Forward]
Benefit obligation at the beginning of the year	243	224
Service cost	2	3	2
Interest cost	10	9	10
Benefits paid	(5)	(4)
Foreign exchange translation	(22)	7
Actuarial loss (gain)	46	4
Benefit obligation at the end of the year	274	243	224
Change in Plan Assets [Roll Forward]
Fair value of plan assets at the beginning of the year	207	178
Actual return of plan assets	19	23
Company contributions	5	5
Benefits paid	(5)	(4)
Foreign exchange translation	(14)	5
Fair value of plan assets at the end of the year	212	207	178
Defined Benefit Plan, Funded Status of Plan [Abstract]
Plan assets less than benefit obligation	(62)	(36)
Postretirement Benefits (U.S.)
Change in Benefit Obligation [Roll Forward]
Benefit obligation at the beginning of the year	16	19
Service cost	0	0	0
Interest cost	1	1	1
Employee contributions	1	1
Benefits paid	(2)	(2)
Actuarial loss (gain)	0	(3)
Benefit obligation at the end of the year	15	16	19
Change in Plan Assets [Roll Forward]
Fair value of plan assets at the beginning of the year	0	0
Company contributions	1	1
Employee contributions	1	1
Benefits paid	(2)	(2)
Fair value of plan assets at the end of the year	0	0	$ 0
Defined Benefit Plan, Funded Status of Plan [Abstract]
Plan assets less than benefit obligation	$ (15)	$ (16)