Employee Benefit Obligations - Weighted Average Assumptions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Weighted-average assumptions used to determine net periodic benefit cost
Pension expense		$ 25
Settlement losses and other one-time charges (a)		4
Forecast
Weighted-average assumptions used to determine net periodic benefit cost
Pension expense	$ 46
Defined Benefit Pension Plans
Weighted-average assumptions used to determine benefit obligations
Effect of one quarter of a percentage point reduction in the expected return on pension assets assumption, on pension expense		9
Effect of quarter of a percentage point reduction in the discount rate applied to the pension liability, on pension expense		12
Weighted-average assumptions used to determine net periodic benefit cost
Pension expense		25	$ 79	$ 189
Settlement losses and other one-time charges (a)		4	14	135
Market related value of plan assets used to calculate expected return		3,683	3,651	5,633
Non U.S. | Defined Benefit Pension Plans
Weighted-average assumptions used to determine net periodic benefit cost
Pension expense		$ (7)	$ 2	$ (8)
U.K. | Defined Benefit Pension Plans
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)		3.95%	5.01%	1.81%
Rate of compensation increase (as a percent)		3.50%	3.50%	3.50%
Pension increase (as a percent)		3.34%	3.43%	3.64%
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate (as a percent)		5.01%	1.81%	1.39%
Rate of compensation increase (as a percent)		3.50%	3.50%	3.50%
Pension increase (as a percent)		3.43%	3.64%	3.19%
Expected long-term rate of return on assets (as a percent)		5.11%	1.91%	1.74%
Germany | Defined Benefit Pension Plans
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)		3.14%	3.69%	1.12%
Rate of compensation increase (as a percent)		2.69%	2.68%	2.50%
Pension increase (as a percent)		2.18%	1.80%	1.70%
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate (as a percent)		3.70%	1.12%	0.80%
Rate of compensation increase (as a percent)		2.69%	2.50%	2.50%
Pension increase (as a percent)		1.80%	1.70%	1.50%
United States | Defined Benefit Pension Plans
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)		5.19%	5.52%	2.87%
Rate of compensation increase (as a percent)		4.48%	4.47%	4.48%
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate (as a percent)		5.52%	2.87%	2.49%
Rate of compensation increase (as a percent)		4.47%	4.48%	4.05%
Expected long-term rate of return on assets (as a percent)		7.09%	6.11%	6.32%
Pension expense		$ 32	$ 77	$ 197
Settlement losses and other one-time charges (a)		$ 4	$ 14	$ 135