Goodwill and Other Intangible Assets - Intangible Assets - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired during the year	$ 0
Finite-lived intangible assets, gross	1,000,000	$ 1,000,000
Net, intangible asset not subject to amortization	54,000,000	53,000,000
Gross carrying amount of capitalized software	992,000,000	1,100,000,000
Capitalized computer software, net	215,000,000	251,000,000
Capitalized computer software, development stage costs	79,000,000
Finite-Lived Intangible Assets, Except Capitalized Internal-Use Software
Finite Lived Intangible Assets [Line Items]
Amortization expense	$ 1,000,000	1,000,000	$ 1,000,000
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	$ 108,000,000	123,000,000	$ 121,000,000
Amortization expense for 2022	90,000,000
Acquired finite-lived intangible asset, residual value	0
Amortization expense for 2023	62,000,000
Amortization expense for 2024	40,000,000
Amortization expense for 2025	9,000,000
Amortization expense for 2026	7,000,000
Amortization expense thereafter	7,000,000
Maximum
Finite Lived Intangible Assets [Line Items]
Finite-Lived intangible assets, net	1,000,000	$ 1,000,000
Maximum | Finite-Lived Intangible Assets, Except Capitalized Internal-Use Software
Finite Lived Intangible Assets [Line Items]
Amortization expense for 2022	$ 1,000,000