Casualty, Environmental and Other Reserves - Schedule of Claims Activity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Loss Contingency Accrual [Roll Forward]
Balance at beginning of period	$ 440	$ 436	$ 368
Charged to Expense	168	165	143
Payments	(146)	(161)	(130)
Balance end of period	462	440	436
Pan-Am
Loss Contingency Accrual [Roll Forward]
Assumed in Acquisition of Pan Am			55
Casualty Reserves
Loss Contingency Accrual [Roll Forward]
Balance at beginning of period	195	194	180
Charged to Expense	72	69	45
Payments	(59)	(68)	(50)
Balance end of period	208	195	194
Casualty Reserves | Pan-Am
Loss Contingency Accrual [Roll Forward]
Assumed in Acquisition of Pan Am			19
Environmental Reserves
Loss Contingency Accrual [Roll Forward]
Balance at beginning of period	154	161	108
Charged to Expense	28	29	47
Payments	(31)	(36)	(30)
Balance end of period	151	154	161
Environmental Reserves | Pan-Am
Loss Contingency Accrual [Roll Forward]
Assumed in Acquisition of Pan Am			36
Other Reserves
Loss Contingency Accrual [Roll Forward]
Balance at beginning of period	91	81	80
Charged to Expense	68	67	51
Payments	(56)	(57)	(50)
Balance end of period	$ 103	$ 91	81
Other Reserves | Pan-Am
Loss Contingency Accrual [Roll Forward]
Assumed in Acquisition of Pan Am			$ 0