Summary of Significant Accounting Policies - Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Trade accounts payable	$ 449	$ 652
Client deposits	931	871
Transferable federal tax credits (see Note 17)	804	0
Accrued compensation and benefits	344	279
Accrued taxes	203	432
Accrued interest	298	216
Accrued payment network fees	232	219
Operating lease liabilities	118	124
Accrued professional fees	96	108
Other accrued expenses	880	982
Total	$ 4,355	$ 3,883