Retirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Type [Extensible Enumeration]			Pension Plan
Net periodic benefit cost (income)	$ 0	$ (8)	$ 0	$ (17)
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	3	5	7	10
Interest cost	1	0	2	1
Expected return on plan assets	(1)	(1)	(3)	(3)
Amortization of prior service cost	(1)	(2)	(2)	(4)
Amortization of net actuarial loss	0	0	0	1
Net curtailments and settlements (Note 6)	0	(8)	0	(17)
Net periodic benefit cost (income)	$ 2	$ (6)	$ 4	$ (12)