Goodwill and Other Intangible Assets (Details) - Other Intangible Assets - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other intangible assets by major asset class
Intangible assets subject to amortization, gross carrying amount	$ 300	$ 309
Intangible assets subject to amortization, accumulated amortization	239	229
Intangible assets subject to amortization, net	61	80
Intangible assets not subject to amortization	226	226
Total other intangible assets, gross carrying amount	526	535
Total other intangible assets, net	287	306
Amortization expense of intangible assets	13	14	$ 14
Estimated intangible asset amortization expense, 2023	12
Estimated intangible asset amortization expense, 2024	12
Estimated intangible asset amortization expense, 2025	11
Estimated intangible asset amortization expense, 2026	11
Estimated intangible asset amortization expense, 2027	8
Customer-related [Member]
Other intangible assets by major asset class
Intangible assets subject to amortization, gross carrying amount	96	104
Intangible assets subject to amortization, accumulated amortization	48	41
Intangible assets subject to amortization, net	48	63
Contract-based [Member]
Other intangible assets by major asset class
Intangible assets subject to amortization, gross carrying amount	204	205
Intangible assets subject to amortization, accumulated amortization	191	188
Intangible assets subject to amortization, net	13	$ 17
Insurance Contracts Acquired in Business Combination [Member]
Other intangible assets by major asset class
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
Estimated intangible asset amortization expense, 2027	$ 1