Segment Reporting and Significant Expenses- Schedule of Reconciliation of Segment Operating Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Segment Operating Income	$ 1,087	$ 1,354	$ 3,411	$ 4,139
Revenue	3,587	3,619	10,584	11,001
Trucking Expenses and Eliminations	(2,500)	(2,265)	(7,173)	(6,862)
Operating Income	1,087	1,354	3,411	4,139
Interest Expense	(210)	(206)	(631)	(625)
Other Income - Net	21	36	69	105
Earnings Before Income Taxes	898	1,184	2,849	3,619
Operating Segments
Segment Reporting Information [Line Items]
Segment Operating Income	1,256	1,351	3,571	4,123
Operating Income	1,256	1,351	3,571	4,123
Operating Segments | Trucking Operations
Segment Reporting Information [Line Items]
Revenue	215	216	641	655
Trucking Expenses and Eliminations	(384)	(213)	(801)	(639)
Eliminations
Segment Reporting Information [Line Items]
Revenue	(8)	(2)	(21)	(5)
Trucking Expenses and Eliminations	8	2	21	5
Eliminations | Trucking Operations
Segment Reporting Information [Line Items]
Revenue	207	214	620	650
Trucking Expenses and Eliminations	$ (376)	$ (211)	$ (780)	$ (634)