Policy Claims and Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Liability for Claims and Claims Adjustment Expense	$ 8,233	$ 8,284	$ 8,053	$ 7,556
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	(567)	(732)	(556)	(641)
Liability For Unpaid Claims And Claims Adjustment Expense Net Of Recoverable	7,666	7,552	$ 7,497	$ 6,915
Current Year Claims and Claims Adjustment Expense	3,438	4,097
Prior Year Claims and Claims Adjustment Expense	(82)	(59)
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims	3,356	4,038
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year	(161)	(164)
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	(3,051)	(3,196)
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid	(3,212)	(3,360)
Interest On Liability For Policy And Contract Claims	8	10
Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Translation Gain (Loss)	17	(51)
Liability for Unpaid Claims and Claims Adjustment Expense Other	$ 25	$ 41