Employee Benefit Plans - Defined Benefit Plan and Other Postretirement Benefit Plans Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit gain	$ 12	$ 8	$ 10
Other comprehensive income (loss), before tax	4	4	18
Plan assets	279	280
Defined Pension  Benefits
Defined Benefit Plan Disclosure [Line Items]
AOCI not yet recognized	(33)	(40)
Plan assets	273	274	254
Expected benefits to be paid in the next ten years	108
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
AOCI not yet recognized	3	6
Plan assets	6	$ 6	$ 6
Expected benefits to be paid in the next ten years	$ 12