Goodwill and Other Intangible Assets (Details) - Other Intangible Assets - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Other intangible assets by major asset class
Intangible assets subject to amortization, gross carrying amount	$ 307		$ 309
Intangible assets subject to amortization, accumulated amortization	232		229
Intangible assets subject to amortization, net	75		80
Intangible assets not subject to amortization	226		226
Total other intangible assets, gross carrying amount	533		535
Total other intangible assets, net	301		306
Amortization expense of intangible assets	3	$ 4
Estimated intangible asset amortization expense, remainder of 2022	10
Estimated intangible asset amortization expense, 2023	13
Estimated intangible asset amortization expense, 2024	12
Estimated intangible asset amortization expense, 2025	12
Estimated intangible asset amortization expense, 2026	11
Customer-related [Member]
Other intangible assets by major asset class
Intangible assets subject to amortization, gross carrying amount	102		104
Intangible assets subject to amortization, accumulated amortization	43		41
Intangible assets subject to amortization, net	59		63
Contract-based [Member]
Other intangible assets by major asset class
Intangible assets subject to amortization, gross carrying amount	205		205
Intangible assets subject to amortization, accumulated amortization	189		188
Intangible assets subject to amortization, net	16		$ 17
Insurance Contracts Acquired in Business Combination [Member]
Other intangible assets by major asset class
Estimated intangible asset amortization expense, remainder of 2022	2
Estimated intangible asset amortization expense, 2023	3
Estimated intangible asset amortization expense, 2024	2
Estimated intangible asset amortization expense, 2025	2
Estimated intangible asset amortization expense, 2026	$ 1