Fair Value of Assets and Liabilities - Change in level 3 assets and liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Gains (losses) included in net income for Level 3 assets and liabilities:
Total recurring Level 3 assets	$ 55	$ 91	$ (2)
Total recurring Level 3 liabilities	0	0	$ (43)
Fair Value Recurring Basis Unobservable Input Reconciliation Liability Gain Loss Statement Of Income Extensible List Not Disclosed Flag			Total included in net income
Total included in net income	55	91	$ (45)
Total included in net income	55	91	(2)
Changes in unrealized net capital gains and losses reported in OCI	$ (4)	$ 3	$ (9)
Net investment income
Gains (losses) included in net income for Level 3 assets and liabilities:
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net investment income	Net investment income	Net investment income
Total included in net income	$ 14	$ 1	$ (16)
Net gains (losses) on investments and derivatives
Gains (losses) included in net income for Level 3 assets and liabilities:
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net gains (losses) on investments and derivatives	Net gains (losses) on investments and derivatives	Net gains (losses) on investments and derivatives
Total included in net income	$ 41	$ 90	$ 14
Liabilities held for sale
Gains (losses) included in net income for Level 3 assets and liabilities:
Total recurring Level 3 liabilities	0	0	(43)
Municipal
Gains (losses) included in net income for Level 3 assets and liabilities:
Changes in unrealized net capital gains and losses reported in OCI	1	0	0
Corporate - public
Gains (losses) included in net income for Level 3 assets and liabilities:
Total recurring Level 3 assets	0	0	(1)
Changes in unrealized net capital gains and losses reported in OCI	(5)	0	1
Corporate - privately placed
Gains (losses) included in net income for Level 3 assets and liabilities:
Total recurring Level 3 assets	1	(2)	0
Changes in unrealized net capital gains and losses reported in OCI	0	3	(5)
Assets held for sale
Gains (losses) included in net income for Level 3 assets and liabilities:
Changes in unrealized net capital gains and losses reported in OCI	0	0	(5)
Fixed income securities
Gains (losses) included in net income for Level 3 assets and liabilities:
Total recurring Level 3 assets	1	(2)	(1)
Equity securities
Gains (losses) included in net income for Level 3 assets and liabilities:
Total recurring Level 3 assets	14	28	(1)
Other investments
Gains (losses) included in net income for Level 3 assets and liabilities:
Total recurring Level 3 assets	2	0	0
Other assets
Gains (losses) included in net income for Level 3 assets and liabilities:
Total recurring Level 3 assets	$ 38	$ 65	$ 0