Pension and Postretirement Expense Level 4 (Details) - Change in Benefit Obligations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Foreign Plan [Member] | Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 636	$ 548
Service cost	17	16	$ 14
Interest cost	10	9	10
Actuarial (gains) losses	(38)	(6)
Foreign currency exchange rate changes	(32)	77
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(11)	(11)
Plan settlements	0	2
Expenses paid from assets	0	0
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant	1	1
Benefit obligation at end of year	583	636	548
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	412	349
Actual return on plan assets	(1)	4
Foreign currency exchange rate changes	(20)	48
Employer contributions	23	21
Defined Benefit Plan, Plan Assets, Benefits Paid	(11)	(11)
Defined Benefit Plan, Plan Assets, Payment for Settlement	0	0
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	1	1
Fair value of plan assets at end of year	404	412	349
Funded status of the plan at end of year	(179)	(224)
Foreign Plan [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	11	10
Service cost	0	0
Interest cost	1	1	1
Actuarial (gains) losses	2	0
Foreign currency exchange rate changes	(1)	0
Defined Benefit Plan, Benefit Obligation, Benefits Paid	0	0
Plan settlements	0	0
Expenses paid from assets	0	0
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant	0	0
Benefit obligation at end of year	13	11	10
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Foreign currency exchange rate changes	0	0
Employer contributions	0	0
Defined Benefit Plan, Plan Assets, Benefits Paid	0	0
Defined Benefit Plan, Plan Assets, Payment for Settlement	0	0
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	0	0
Fair value of plan assets at end of year	0	0	0
Funded status of the plan at end of year	(13)	(11)
UNITED STATES | Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	238	242
Service cost	3	3	3
Interest cost	7	7	8
Actuarial (gains) losses	(12)	6
Foreign currency exchange rate changes	0	0
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(17)	(17)
Plan settlements	0	0
Expenses paid from assets	(3)	(3)
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant	0	0
Benefit obligation at end of year	216	238	242
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	213	207
Actual return on plan assets	(8)	26
Foreign currency exchange rate changes	0	0
Employer contributions	0	0
Defined Benefit Plan, Plan Assets, Benefits Paid	(17)	(17)
Defined Benefit Plan, Plan Assets, Payment for Settlement	0	0
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	0	0
Fair value of plan assets at end of year	185	213	207
Funded status of the plan at end of year	(31)	(25)
UNITED STATES | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	5	6
Service cost	0	0
Interest cost	0	0	0
Actuarial (gains) losses	(1)	(1)
Foreign currency exchange rate changes	0	0
Defined Benefit Plan, Benefit Obligation, Benefits Paid	0	0
Plan settlements	(4)	0
Expenses paid from assets	0	0
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant	0	0
Benefit obligation at end of year	0	5	6
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Foreign currency exchange rate changes	0	0
Employer contributions	5	1
Defined Benefit Plan, Plan Assets, Benefits Paid	0	(1)
Defined Benefit Plan, Plan Assets, Payment for Settlement	(5)	0
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	0	0
Fair value of plan assets at end of year	0	0	$ 0
Funded status of the plan at end of year	$ 0	$ (5)