Pension and Postretirement Expense Level 4 (Details) - Change in Benefit Obligations - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Foreign Plan [Member] | Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of period	$ 678	$ 583	$ 636
Service cost	8	7	17	$ 16
Interest cost	4	4	10	9
Actuarial losses (gains)	12	93	(38)
Foreign currency exchange rate changes	(8)	(3)	(32)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(6)	(6)	(11)
Expenses paid from assets	0	0	0
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant	0	0	1
Benefit obligation at end of period	688		583	636
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	470	404	412
Actual return on plan assets	9	60	(1)
Foreign currency exchange rate changes	(5)	(2)	(20)
Employer contributions	15	14	23
Defined Benefit Plan, Plan Assets, Benefits Paid	(6)	(6)	(11)
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	0	0	1
Fair value of plan assets at end of period	483		404	412
Funded status of the plan at end of period	(205)		(179)
Foreign Plan [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of period	17	13	11
Interest cost	0	0	1	1
Actuarial losses (gains)	(4)	4	2
Foreign currency exchange rate changes	0	0	(1)
Plan settlements	0	0	0
Benefit obligation at end of period	13		13	11
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	0	0	0
Employer contributions	0	0	0
Defined Benefit Plan, Plan Assets, Payment for Settlement	0	0	0
Fair value of plan assets at end of period	0		0	0
Funded status of the plan at end of period	(13)		(13)
UNITED STATES | Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of period	228	216	238
Service cost	2	2	3	3
Interest cost	3	4	7	7
Actuarial losses (gains)	3	14	(12)
Foreign currency exchange rate changes	0	0	0
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(8)	(8)	(17)
Expenses paid from assets	3	0	(3)
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant	0	0	0
Benefit obligation at end of period	225		216	238
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	196	185	213
Actual return on plan assets	10	19	(8)
Foreign currency exchange rate changes	0	0	0
Employer contributions	2	0	0
Defined Benefit Plan, Plan Assets, Benefits Paid	(8)	(8)	(17)
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	0	0	0
Fair value of plan assets at end of period	197		185	213
Funded status of the plan at end of period	(28)		(31)
UNITED STATES | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of period	0	0	5
Interest cost	0	0	0	0
Actuarial losses (gains)	0	0	(1)
Foreign currency exchange rate changes	0	0	0
Plan settlements	0	0	(4)
Benefit obligation at end of period	0		0	5
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	0	0	0
Employer contributions	0	0	5
Defined Benefit Plan, Plan Assets, Payment for Settlement	0	$ 0	(5)
Fair value of plan assets at end of period	0		0	$ 0
Funded status of the plan at end of period	$ 0		$ 0