Severance (Details) - Severance - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Restructuring reserve [Roll Forward]
Balance at the beginning of the period		$ 11	$ 36
Accrued to expense		74	12
Payments, net		(67)	(37)
Balance at the end of the period	$ 18	$ 18	$ 11
Global Workforce Reduction
Restructuring Cost and Reserve [Line Items]
Percentage of positions eliminated	4.00%
Restructuring costs	$ 53