Goodwill and Other Intangible Assets (Details) - Other Intangible Assets - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Other intangible assets by major asset class
Intangible assets subject to amortization, gross carrying amount	$ 299		$ 299		$ 304
Intangible assets subject to amortization, accumulated amortization	206		206		200
Intangible assets subject to amortization, net	93		93		104
Intangible assets not subject to amortization	226		226		226
Total other intangible assets, gross carrying amount	525		525		530
Total other intangible assets, net	319		319		330
Amortization expense of intangible assets	3	$ 4	7	$ 8
Estimated intangible asset amortization expense, remainder of 2020	7		7
Estimated intangible asset amortization expense, 2021	13		13
Estimated intangible asset amortization expense, 2022	12		12
Estimated intangible asset amortization expense, 2023	12		12
Estimated intangible asset amortization expense, 2024	11		11
Customer-related [Member]
Other intangible assets by major asset class
Intangible assets subject to amortization, gross carrying amount	95		95		99
Intangible assets subject to amortization, accumulated amortization	25		25		21
Intangible assets subject to amortization, net	70		70		78
Contract-based [Member]
Other intangible assets by major asset class
Intangible assets subject to amortization, gross carrying amount	204		204		205
Intangible assets subject to amortization, accumulated amortization	181		181		179
Intangible assets subject to amortization, net	23		23		$ 26
Insurance Contracts Acquired in Business Combination [Member]
Other intangible assets by major asset class
Estimated intangible asset amortization expense, remainder of 2020	2		2
Estimated intangible asset amortization expense, 2021	4		4
Estimated intangible asset amortization expense, 2022	3		3
Estimated intangible asset amortization expense, 2023	3		3
Estimated intangible asset amortization expense, 2024	$ 2		$ 2