Employee Benefit Plans - Benefit Obligation and Plan Assets (Details) - Pension Benefits - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Change in benefit obligation:
Benefit obligation at beginning of year	$ 3,806	$ 3,451
Service cost	27	27	$ 21
Interest cost	64	77	90
Actuarial (gain) loss	(154)	393
Benefits paid	(111)	(101)
Curtailments	(9)	(3)
Settlements	(33)	(79)
Other	2	1
Foreign currency translation adjustments	(42)	40
Benefit obligation at end of year	3,550	3,806	3,451
Change in plan assets:
Fair value of plan assets at beginning of year	3,202	3,004
Actual return on plan assets	83	347
Employer contributions	28	20
Benefits paid	(111)	(101)
Settlements	(33)	(79)
Foreign currency translation adjustments	(22)	11
Fair value of plan assets at end of year	3,147	3,202	$ 3,004
Funded status - underfunded at end of year	(403)	(604)
Accumulated benefit obligation	$ 3,497	$ 3,755