Retirement Plans (Change in Plan Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning fair value of plan assets	$ 522	$ 428
Actual return	17	30
Employer contributions	33	33
Employee contributions	8	8
Foreign exchange impact	(29)	37
Benefits paid	(8)	(14)
Ending fair value of plan assets	$ 543	$ 522