Policyholder Account Balances (Account Balances) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Policyholder Account Balance [Line Items]
Policyholder Account Balance	$ 23,911	$ 22,256
Interest credited	215	141
Policyholder Account Balance, Increase (Decrease) from Other Change	70	49
Accounting Standards Update 2018-12
Policyholder Account Balance [Line Items]
Interest credited			$ 682	$ 700
Life Insurance Product Line [Member] | Americas [Member] | Other Segments
Policyholder Account Balance [Line Items]
Policyholder Account Balance	1,646	1,699	1,683	1,719
Policyholder Account Balance, Issuance	3	3
Policyholder Account Balance, Policy Charge	(8)	(8)
Policyholder Account Balance, Surrender and Withdrawal	(5)	(4)
Policyholder Account Balance, Benefit Payment	(43)	(27)
Interest credited	16	16
Policyholder Account Balance Foreign Currency Translation	0	0
Policyholder Account Balance Reinsurance Recoverable	0	0
Policyholder Account Balance After Reinsurance	1,646	1,699
Policyholder Account Balance, Net Amount at Risk	697	728
Policyholder Account Balance, Cash Surrender Value	$ 1,635	$ 1,688
Policyholder Account Balance, Weighted Average Crediting Rate	4.00%	4.00%
Life Insurance Product Line [Member] | Americas [Member] | Accounting Standards Update 2018-12 | Other Segments
Policyholder Account Balance [Line Items]
Policyholder Account Balance			1,683	1,719	$ 1,752
Policyholder Account Balance, Issuance			24	25
Policyholder Account Balance, Policy Charge			(32)	(32)
Policyholder Account Balance, Surrender and Withdrawal			(17)	(13)
Policyholder Account Balance, Benefit Payment			(76)	(79)
Interest credited			65	66
Policyholder Account Balance Foreign Currency Translation			0	0
Policyholder Account Balance Reinsurance Recoverable			0	0
Policyholder Account Balance After Reinsurance			1,683	1,719
Insurance, Other | Americas [Member] | Other Segments
Policyholder Account Balance [Line Items]
Policyholder Account Balance	$ 18,437	$ 18,644	18,906	18,758
Policyholder Account Balance, Issuance	41	152
Policyholder Account Balance, Policy Charge	(8)	(8)
Policyholder Account Balance, Surrender and Withdrawal	(528)	(296)
Policyholder Account Balance, Benefit Payment	(116)	(115)
Interest credited	142	153
Policyholder Account Balance Foreign Currency Translation	0	0
Policyholder Account Balance Reinsurance Recoverable	(1,532)	(1,552)
Policyholder Account Balance After Reinsurance	16,905	17,092
Policyholder Account Balance, Net Amount at Risk	2,468	2,561
Policyholder Account Balance, Cash Surrender Value	$ 18,398	$ 18,552
Policyholder Account Balance, Weighted Average Crediting Rate	3.30%	3.20%
Insurance, Other | Americas [Member] | Accounting Standards Update 2018-12 | Other Segments
Policyholder Account Balance [Line Items]
Policyholder Account Balance			18,906	18,758	16,273
Policyholder Account Balance, Issuance			1,289	3,290
Policyholder Account Balance, Policy Charge			(33)	(31)
Policyholder Account Balance, Surrender and Withdrawal			(1,258)	(1,015)
Policyholder Account Balance, Benefit Payment			(448)	(404)
Interest credited			598	645
Policyholder Account Balance Foreign Currency Translation			0	0
Policyholder Account Balance Reinsurance Recoverable			(1,543)	(1,561)
Policyholder Account Balance After Reinsurance			17,363	17,197
Insurance, Other | Asia Pacific [Member] | Other Segments
Policyholder Account Balance [Line Items]
Policyholder Account Balance	$ 3,758	$ 1,864	3,351	1,621
Policyholder Account Balance, Issuance	431	246
Policyholder Account Balance, Policy Charge	0	(1)
Policyholder Account Balance, Surrender and Withdrawal	(19)	(15)
Policyholder Account Balance, Benefit Payment	(22)	(6)
Interest credited	32	6
Policyholder Account Balance Foreign Currency Translation	(15)	(13)
Policyholder Account Balance Reinsurance Recoverable	0	0
Policyholder Account Balance After Reinsurance	3,758	1,864
Policyholder Account Balance, Net Amount at Risk	0	0
Policyholder Account Balance, Cash Surrender Value	$ 3,340	$ 1,636
Policyholder Account Balance, Weighted Average Crediting Rate	2.90%	1.40%
Insurance, Other | Asia Pacific [Member] | Accounting Standards Update 2018-12 | Other Segments
Policyholder Account Balance [Line Items]
Policyholder Account Balance			3,351	1,621	$ 809
Policyholder Account Balance, Issuance			2,521	868
Policyholder Account Balance, Policy Charge			(134)	(1)
Policyholder Account Balance, Surrender and Withdrawal			(639)	(36)
Policyholder Account Balance, Benefit Payment			(46)	(24)
Interest credited			51	19
Policyholder Account Balance Foreign Currency Translation			(23)	(14)
Policyholder Account Balance Reinsurance Recoverable			0	0
Policyholder Account Balance After Reinsurance			$ 3,351	$ 1,621