Retirement Benefit Plans - Benefit Obligation and Plan Assets (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in plan assets:
Funded status of plan		$ (208)	$ (200)
Amounts recognized in Balance Sheet [Abstract]
Non-current liabilities		(306)	(298)
Other Postretirement Benefits Plan [Member]
Change in benefit obligation [Roll Forward]
Projected benefit obligation, January 1		87	107
Interest cost		3	3	$ 3
Plan amendments		0	0
Actuarial (gain) loss		3	(6)
Benefits paid		(12)	(17)
Projected benefit obligation, December 31		81	87	107
Change in plan assets:
Funded status of plan		(81)	(87)
Amounts recognized in Balance Sheet [Abstract]
Non-current assets		0	0
Current liabilities		(10)	(11)
Non-current liabilities		(71)	(76)
Net amount		(81)	(87)
Amounts recognized in accumulated other comprehensive Income Loss) [Abstract]
Net actuarial loss		16	13
Net prior service (credit) cost		(8)	(12)
Net amount	[1]	8	1
United States
Change in plan assets:
Funded status of plan		(22)	(37)
United States | Pension Plan [Member]
Change in benefit obligation [Roll Forward]
Projected benefit obligation, January 1		253	283
Interest cost		8	9	9
Settlement and curtailment		(65)
Actuarial (gain) loss		17	(18)
Benefits paid		(15)	(21)
Projected benefit obligation, December 31		198	253	283
Change in plan assets:
Fair value of plan assets, January 1		216	240
Actual return on plan assets		29	(11)
Employer contribution		10	7
Settlements		(65)
Benefits paid		(14)	(20)
Fair value of plan assets, December 31		176	216	240
Funded status of plan		(22)	(37)
Amounts recognized in Balance Sheet [Abstract]
Non-current assets		0	0
Current liabilities		(1)
Non-current liabilities		(21)	(37)
Net amount		(22)	(37)
Amounts recognized in accumulated other comprehensive Income Loss) [Abstract]
Net actuarial loss		82	113
Net prior service (credit) cost		(5)	(6)
Net amount	[1]	77	107
Defined Benefit Plan, Accumulated Benefit Obligation		198	253
Non-US [Member] | Pension Plan [Member]
Change in benefit obligation [Roll Forward]
Projected benefit obligation, January 1		612	629
Service cost		18	18	18
Interest cost		12	12	11
Plan amendments			2
Settlement and curtailment		(5)	(4)
Actuarial (gain) loss		75	5
Currency translation		(1)	(30)
Benefits paid		(16)	(20)
Projected benefit obligation, December 31		695	612	629
Change in plan assets:
Fair value of plan assets, January 1		438	483
Actual return on plan assets		68	(18)
Employer contribution		16	19
Settlements		(5)	(4)
Currency translation		4	(22)
Benefits paid		(16)	(20)
Fair value of plan assets, December 31		505	438	$ 483
Funded status of plan		(190)	(174)
Amounts recognized in Balance Sheet [Abstract]
Non-current assets		28	17
Current liabilities		(4)	(5)
Non-current liabilities		(214)	(186)
Net amount		(190)	(174)
Amounts recognized in accumulated other comprehensive Income Loss) [Abstract]
Net actuarial loss		211	193
Net prior service (credit) cost		2	2
Net amount	[1]	213	195
Defined Benefit Plan, Accumulated Benefit Obligation		$ 660	$ 583

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