Business Combinations - Estimated Fair Values of Aggregate Assets and Liabilities Acquired (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Fair Value Of Assets And Liabilities Statement [Line Items]
Cash paid	$ 934
Common stock issued	0	$ 18	$ 15
Other payable	27
Recorded earn-out payable	73	$ 67	$ 73
Total consideration	1,034
Maximum potential earn-out payable	187
Allocation of purchase price:
Cash and equivalents	10
Fiduciary cash	34
Fiduciary receivables	15
Other current assets	34
Goodwill	707
Purchased customer accounts and other intangibles	399
Other assets	20
Total assets acquired	1,219
Fiduciary liabilities	(62)
Other current liabilities	(18)
Deferred income tax, net	(87)
Other long-term liabilities	(12)
Total liabilities assumed	(179)
Acquired non-controlling interest	(6)
Net assets acquired	1,034
The Canopy Group | Retail
Fair Value Of Assets And Liabilities Statement [Line Items]
Cash paid	51
Other payable	0
Recorded earn-out payable	11
Total consideration	62
Maximum potential earn-out payable	74
Allocation of purchase price:
Cash and equivalents	0
Fiduciary cash	0
Fiduciary receivables	0
Other current assets	0
Goodwill	39
Purchased customer accounts and other intangibles	23
Other assets	0
Total assets acquired	62
Fiduciary liabilities	0
Other current liabilities	0
Deferred income tax, net	0
Other long-term liabilities	0
Total liabilities assumed	0
Acquired non-controlling interest	0
Net assets acquired	62
Quintes Holding B.V | Retail
Fair Value Of Assets And Liabilities Statement [Line Items]
Cash paid	695
Other payable	0
Recorded earn-out payable	0
Total consideration	695
Maximum potential earn-out payable	0
Allocation of purchase price:
Cash and equivalents	0
Fiduciary cash	11
Fiduciary receivables	10
Other current assets	25
Goodwill	468
Purchased customer accounts and other intangibles	302
Other assets	17
Total assets acquired	833
Fiduciary liabilities	(34)
Other current liabilities	(15)
Deferred income tax, net	(78)
Other long-term liabilities	(11)
Total liabilities assumed	(138)
Acquired non-controlling interest	0
Net assets acquired	695
Other Acquisitions | Various
Fair Value Of Assets And Liabilities Statement [Line Items]
Cash paid	188
Other payable	27
Recorded earn-out payable	62
Total consideration	277
Maximum potential earn-out payable	113
Allocation of purchase price:
Cash and equivalents	10
Fiduciary cash	23
Fiduciary receivables	5
Other current assets	9
Goodwill	200
Purchased customer accounts and other intangibles	74
Other assets	3
Total assets acquired	324
Fiduciary liabilities	(28)
Other current liabilities	(3)
Deferred income tax, net	(9)
Other long-term liabilities	(1)
Total liabilities assumed	(41)
Acquired non-controlling interest	(6)
Net assets acquired	$ 277