Goodwill and Other Intangible Assets - Intangible Assets - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Finite Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired during the year		$ 0
Finite-lived intangible assets, gross	$ 27,000,000	4,000,000
Finite-Lived intangible assets, net	20,000,000	2,000,000
Net, intangible asset not subject to amortization	41,000,000	50,000,000
Gross carrying amount of capitalized software	959,000,000	968,000,000
Capitalized computer software, net	144,000,000	170,000,000
Capitalized computer software, development stage costs	68,000,000
Finite-Lived Intangible Assets, Except Capitalized Internal-Use Software
Finite Lived Intangible Assets [Line Items]
Amortization expense	5,000,000	1,000,000	$ 1
Amortization expense for 2024	8,000,000
Amortization expense for 2025	8,000,000
Amortization expense for 2026	$ 4,000,000
Capitalized Internal Use Software, Significant System Conversions
Finite Lived Intangible Assets [Line Items]
Weighted-average amortization period	3 years
Capitalized Internal Use Software
Finite Lived Intangible Assets [Line Items]
Amortization expense	$ 80,000,000	$ 85,000,000	$ 108,000,000
Amortization expense for 2024	57,000,000
Amortization expense for 2025	39,000,000
Amortization expense for 2026	27,000,000
Amortization expense for 2027	12,000,000
Amortization expense for 2028	7,000,000
Amortization expense thereafter	2,000,000
Acquired finite-lived intangible asset, residual value	$ 0