Fair Value Measurements - Changes in balances of Level 3 financial liabilities carried at fair value (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial liabilities, Beginning Balance	$ (23)	$ (23)	$ (3,933)
Total realized/unrealized gains (losses) included in Net income	0	0	(222)
Total realized/unrealized gains (losses) included in other comprehensive income (loss)	0	0	0
Purchases and issuances	(2)	(2)	(146)
Sales and settlements	0	0	158
Transfer into Level 3	0	0	0
Transfer out of Level 3	0	0	0
Sale of annuity business			4,143
Financial liabilities, Ending Balance	(25)	(25)	0
Contingent consideration — acquisitions
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial liabilities, Beginning Balance	(23)	(23)
Total realized/unrealized gains (losses) included in Net income	0	0
Total realized/unrealized gains (losses) included in other comprehensive income (loss)	0	0
Purchases and issuances	(2)	(2)
Sales and settlements	0	0
Transfer into Level 3	0	0
Transfer out of Level 3	0	0
Financial liabilities, Ending Balance	$ (25)	$ (25)
Liabilities of discontinued annuity operations | Annuity subsidiaries
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial liabilities, Beginning Balance			(3,933)
Total realized/unrealized gains (losses) included in Net income			(222)
Total realized/unrealized gains (losses) included in other comprehensive income (loss)			0
Purchases and issuances			(146)
Sales and settlements			158
Transfer into Level 3			0
Transfer out of Level 3			0
Sale of annuity business			4,143
Financial liabilities, Ending Balance			$ 0