Company Restructuring - Changes in the restructuring liability (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Restructuring Reserve
Restructuring liability as of December 31, 2020	$ 72
Expense incurred	195
Adjustments to liability	(25)
Payments and non-cash charges	(221)
Restructuring liability as of December 31, 2021	21
Employee costs
Restructuring Reserve
Restructuring liability as of December 31, 2020	72
Expense incurred	51
Adjustments to liability	(25)
Payments and non-cash charges	(84)
Restructuring liability as of December 31, 2021	14
Exit costs
Restructuring Reserve
Restructuring liability as of December 31, 2020	0
Expense incurred	144
Adjustments to liability	0
Payments and non-cash charges	(137)
Restructuring liability as of December 31, 2021	$ 7