Restructuring - Schedule of Accrued Restructuring Included in Accrued Expenses and Other Liabilities by Cost Type (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restructuring Reserve [Roll Forward]
Costs charged to expense	$ 77	$ 94	$ 132
Cumulative charges incurred through December 31, 2021	303
2019 Restructuring Plan
Restructuring Reserve [Roll Forward]
Balance, beginning	91	35
Costs charged to expense	79	87
Cash payments	(61)	(25)
Non-cash charge adjustment	(24)	(6)
Balance, ending	85	91	35
Cumulative charges incurred through December 31, 2021	298
Severance and employee related costs | 2019 Restructuring Plan
Restructuring Reserve [Roll Forward]
Balance, beginning	88	32
Costs charged to expense	36	76
Cash payments	(55)	(20)
Non-cash charge adjustment	(5)	0
Balance, ending	64	88	32
Cumulative charges incurred through December 31, 2021	188
Facilities and related costs | 2019 Restructuring Plan
Restructuring Reserve [Roll Forward]
Balance, beginning	0	0
Costs charged to expense	16	6
Cash payments	0	0
Non-cash charge adjustment	(16)	(6)
Balance, ending	0	0	0
Cumulative charges incurred through December 31, 2021	51
Other costs | 2019 Restructuring Plan
Restructuring Reserve [Roll Forward]
Balance, beginning	3	3
Costs charged to expense	27	5
Cash payments	(6)	(5)
Non-cash charge adjustment	(3)	0
Balance, ending	21	$ 3	$ 3
Cumulative charges incurred through December 31, 2021	$ 59