Retirement Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Actual contribution to defined benefit pension plans			$ 12
Defined Benefit Plan, Benefit Obligation, Payment for Settlement			63
Components of net periodic benefit cost:
Settlement			26	$ 0
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year	$ 15		15
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year	20		20
Other Postretirement Benefits Plan [Member]
Components of net periodic benefit cost:
Service cost	0	$ 0	0	0
Interest cost	0	1	2	2
Expected return on plan assets	0	0	0	0
Settlement			0	0
Amortization of unrecognized prior service credit	(1)	(1)	(3)	(3)
Amortization of unrecognized loss	1	0	1	1
Net periodic benefit (income) cost	0	0	0	0
Defined benefit plan settlement with an insurance company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Payment for Settlement			50
Defined Benefit Plan, Plan Assets, Payment for Settlement			50
Defined benefit plan settlement by lump-sum payment to employees [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Payment for Settlement			13
UNITED STATES | Pension Plan [Member]
Components of net periodic benefit cost:
Service cost	0	0	0	0
Interest cost	2	2	7	6
Expected return on plan assets	(3)	(3)	(9)	(10)
Settlement			26	0
Amortization of unrecognized prior service credit	(1)	(1)	(1)	(1)
Amortization of unrecognized loss	2	1	4	3
Net periodic benefit (income) cost	0	(1)	27	(2)
Foreign Plan [Member] | Pension Plan [Member]
Components of net periodic benefit cost:
Service cost	5	5	14	14
Interest cost	3	3	9	9
Expected return on plan assets	(6)	(7)	(17)	(21)
Settlement			0	0
Amortization of unrecognized prior service credit	0	0	0	0
Amortization of unrecognized loss	2	1	7	5
Net periodic benefit (income) cost	$ 4	$ 2	$ 13	$ 7