Strategic Initiatives - Restructuring Liability (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Jun. 30, 2023
Restructuring Reserve [Roll Forward]
Restructuring liability at beginning of period	$ 40	$ 56
Restructuring costs accrued during the period	15	22
Restructuring costs paid during the period	(19)	(42)
Restructuring liability at end of period	36	36
Remaining restructuring liability	36	36	$ 23
Severance and Other Employee Costs
Restructuring Reserve [Roll Forward]
Restructuring liability at beginning of period	2	10
Restructuring costs accrued during the period	4	4
Restructuring costs paid during the period	(4)	(12)
Restructuring liability at end of period	2	2
Remaining restructuring liability	2	2
Lease Termination and Associated Costs
Restructuring Reserve [Roll Forward]
Restructuring liability at beginning of period	38	46
Restructuring costs accrued during the period	0	0
Restructuring costs paid during the period	(4)	(12)
Restructuring liability at end of period	34	34
Remaining restructuring liability	34	34
Other
Restructuring Reserve [Roll Forward]
Restructuring liability at beginning of period	0	0
Restructuring costs accrued during the period	11	18
Restructuring costs paid during the period	(11)	(18)
Restructuring liability at end of period	0	0
Remaining restructuring liability	$ 0	$ 0