Accounting Changes and Error Corrections (Policyholder Balance) (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
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Policyholder Account Balance	$ 23,911	$ 22,256
Interest credited	215	141
Insurance, Other | Americas [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Policyholder Account Balance	18,437	18,644	$ 18,906	$ 18,758
Policyholder Account Balance Reinsurance Recoverable	(1,532)	(1,552)
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 After Reinsurance	16,905	17,092
Insurance, Other | Asia Pacific [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Policyholder Account Balance	3,758	1,864	3,351	1,621
Policyholder Account Balance Reinsurance Recoverable	0	0
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 After Reinsurance	3,758	1,864
Life Insurance Product Line [Member] | Americas [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Policyholder Account Balance	1,646	1,699	1,683	1,719
Policyholder Account Balance Reinsurance Recoverable	0	0
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 After Reinsurance	$ 1,646	$ 1,699
Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest credited			682	700
Accounting Standards Update 2018-12 | Insurance, Other | Americas [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Policyholder Account Balance			18,906	18,758	$ 16,273
Policyholder Account Balance Reinsurance Recoverable			(1,543)	(1,561)
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 After Reinsurance			17,363	17,197
Accounting Standards Update 2018-12 | Insurance, Other | Asia Pacific [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Policyholder Account Balance			3,351	1,621	809
Policyholder Account Balance Reinsurance Recoverable			0	0
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 After Reinsurance			3,351	1,621
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Americas [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Policyholder Account Balance			1,683	1,719	$ 1,752
Policyholder Account Balance Reinsurance Recoverable			0	0
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 After Reinsurance			1,683	1,719
Accounting Standards Update 2018-12 | Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest credited			$ 682	$ 700