Change in Benefit Obligations (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2018
Foreign Plan [Member] | Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of period	$ 678	$ 583	$ 688
Service cost	8	7	18	$ 17
Interest cost	4	4	6	10
Actuarial losses	12	93	43
Foreign currency exchange rate changes	(8)	(3)	61
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(6)	(6)	(13)
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		804	583
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	470	404	483
Actual return on plan assets	9	60	58
Foreign currency exchange rate changes	(5)	(2)	45
Employer contributions	15	14	40
Benefits paid	(6)	(6)	(13)
Expenses paid from assets	0	0	0
Employee contributions	0	0	1
Fair value of plan assets at end of period	483		614	404
Funded status of the plan at end of period	(205)		(190)
Foreign Plan [Member] | Pension Plan [Member] | Discontinued Operations
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of period	29		29
Benefit obligation at end of period	29		36
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Funded status of the plan at end of period	(29)		(36)
Foreign Plan [Member] | Pension Plan [Member] | Continuing Operations
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of period	649		659
Benefit obligation at end of period	659		768
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Funded status of the plan at end of period	(176)		(154)
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	13
Interest cost	0	0	1	1
Actuarial losses	(4)	4	(1)
Foreign currency exchange rate changes	0	0	(1)
Plan settlements	0	0	0
Benefit obligation at end of period	13		12	13
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
Plan settlements	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)		(12)
UNITED STATES | Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of period	228	216	225
Service cost	2	2	2	3
Interest cost	3	4	6	7
Actuarial losses	3	14	17
Foreign currency exchange rate changes	0	0	0
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(8)	(8)	(15)
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		232	216
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	196	185	197
Actual return on plan assets	10	19	18
Foreign currency exchange rate changes	0	0	0
Employer contributions	2	0	0
Benefits paid	(8)	(8)	(15)
Expenses paid from assets	(3)	0	(3)
Employee contributions	0	0	0
Fair value of plan assets at end of period	197		197	185
Funded status of the plan at end of period	(28)		(35)
UNITED STATES | Pension Plan [Member] | Discontinued Operations
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of period	0		0
Benefit obligation at end of period	0		0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Funded status of the plan at end of period	0		0
UNITED STATES | Pension Plan [Member] | Continuing Operations
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of period	228		225
Benefit obligation at end of period	225		232
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Funded status of the plan at end of period	(28)		(35)
UNITED STATES | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of period	0	0	0
Interest cost	0	0	0	0
Actuarial losses	0	0	0
Foreign currency exchange rate changes	0	0	0
Plan settlements	0	0	0
Benefit obligation at end of period	0		0	0
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
Plan settlements	0	$ 0	0
Fair value of plan assets at end of period	0		0	$ 0
Funded status of the plan at end of period	$ 0		$ 0