Goodwill and Other Intangible Assets (Details) - Other Intangible Assets - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other intangible assets by major asset class
Intangible assets subject to amortization, gross carrying amount	$ 309	$ 306
Intangible assets subject to amortization, accumulated amortization	229	215
Intangible assets subject to amortization, net	80	91
Intangible assets not subject to amortization	226	226
Total other intangible assets, gross carrying amount	535	532
Total other intangible assets, net	306	317
Amortization expense of intangible assets	14	14	$ 15
Estimated intangible asset amortization expense, 2022	14
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	104	101
Intangible assets subject to amortization, accumulated amortization	41	31
Intangible assets subject to amortization, net	63	70
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	188	184
Intangible assets subject to amortization, net	17	$ 21
Insurance Contracts Acquired in Business Combination [Member]
Other intangible assets by major asset class
Estimated intangible asset amortization expense, 2022	3
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