Segment Reporting and Significant Expenses- Schedule of Reconciliation of Segment Operating Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Segment Operating Income	$ 1,283	$ 1,448	$ 2,324	$ 2,785
Revenue	3,574	3,701	6,997	7,382
Trucking Expenses and Eliminations	(2,291)	(2,253)	(4,673)	(4,597)
Operating Income	1,283	1,448	2,324	2,785
Interest Expense	(212)	(209)	(421)	(419)
Other Income - Net	22	28	48	69
Earnings Before Income Taxes	1,093	1,267	1,951	2,435
Operating Segments
Segment Reporting Information [Line Items]
Segment Operating Income	1,277	1,441	2,315	2,772
Operating Income	1,277	1,441	2,315	2,772
Operating Segments | Trucking Operating Segment
Segment Reporting Information [Line Items]
Revenue	219	223	426	440
Trucking Expenses and Eliminations	(213)	(216)	(417)	(427)
Eliminations
Segment Reporting Information [Line Items]
Revenue	(8)	(2)	(13)	(4)
Trucking Expenses and Eliminations	8	2	13	4
Eliminations | Trucking Operating Segment
Segment Reporting Information [Line Items]
Revenue	211	221	413	436
Trucking Expenses and Eliminations	$ (205)	$ (214)	$ (404)	$ (423)