Stock-Based Compensation - Summary of Share-Based Compensation Expense Income Tax Benefit Awards Issued Under Incentive Plans (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense		$ 62	$ 59	$ 86
Income tax benefit		$ 12	7	20
Deferred compensation
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares held in employee trust earned but not distributed (in shares)		495,774
Restricted stock units - employees and non-employee directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense		$ 47	37	38
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense		6	14	24
Performance share awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense		9	15	22
Share-based payment arrangement, accelerated cost	$ 7
Deferred performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense		$ 0	$ (7)	$ 2