Segment Information - Summarized Financial Information Reportable Segments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Total revenues	$ 5,902	$ 4,805	$ 4,257
Employee compensation and benefits	2,935	2,406	2,187
Other operating expenses	959	710	650
(Gain)/loss on disposal	2	(31)	(143)
Interest expense	297	193	190
Change in estimated acquisition earn-out payables	25	2	21
Income before income taxes	1,371	1,303	1,146
Operating Segments
Segment Reporting Information [Line Items]
Total revenues	5,815	4,745	4,222
Income before income taxes	1,572	1,380	1,214
Operating Segments | Retail
Segment Reporting Information [Line Items]
Total revenues	3,406	2,729	2,508
Employee compensation and benefits	1,848	1,462	1,336
Other operating expenses	563	449	421
(Gain)/loss on disposal	2	(3)	(3)
Depreciation and amortization	250	140	131
Interest expense	28	71	85
Change in estimated acquisition earn-out payables	8	8	1
Income before income taxes	707	602	537
Operating Segments | Specialty Distribution
Segment Reporting Information [Line Items]
Total revenues	2,409	2,016	1,714
Employee compensation and benefits	919	772	709
Other operating expenses	458	382	332
(Gain)/loss on disposal	0	(28)	(141)
Depreciation and amortization	112	77	69
Interest expense	38	41	48
Change in estimated acquisition earn-out payables	17	(6)	20
Income before income taxes	865	778	677
Segment Reconciling Items
Segment Reporting Information [Line Items]
Total revenues	87	60	35
Income before income taxes	$ (201)	$ (77)	$ (68)