Supplemental Disclosures of Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2023

Supplemental Cash Flow Elements [Abstract]

Supplemental Disclosures Regarding Cash Flow Information and Non-cash Flow Investing and Financing Activities

Supplemental disclosures regarding cash flow information and non-cash investing and financing activities are as follows:

	As of and for the years ended December 31,
	2023			2022			2021
Supplemental disclosures of cash flow information:
Cash and cash equivalents	$	1,424		$	1,262		$	4,486
Fiduciary funds (included in fiduciary assets)		2,368			3,459			3,203
Cash and cash equivalents and fiduciary funds (included in current assets held    for sale)		—			—			2
Total cash, cash equivalents and restricted cash	$	3,792		$	4,721		$	7,691
Increase/(decrease) in cash, cash equivalents and other restricted cash	$	163		$	(3,177	)	$	2,425
(Decrease)/increase in fiduciary funds		(1,103	)		371			(908	)
Total	$	(940	)	$	(2,806	)	$	1,517
Cash payments for income taxes, net	$	348		$	428		$	570
Cash payments for interest	$	223		$	201		$	212
Cash acquired	$	—		$	30		$	5
Supplemental disclosures of non-cash investing and financing activities:
Non-cash consideration received	$	—		$	63		$	—
Fair value of deferred and contingent consideration related to acquisitions	$	3		$	28		$	21