Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 4,166	$ 3,234
Less: Accumulated depreciation	(2,208)	(1,492)
Total	1,958	1,742
Depreciation expense	555	498	$ 523
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	47	48
Data processing equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 3,025	2,302
Data processing equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	3 years
Data processing equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 years
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 724	512
Buildings and leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 years
Buildings and leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	40 years
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 370	$ 372
Furniture and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 years
Furniture and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	8 years