Accounting Changes and Error Corrections (Policyholder Balance) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Policyholder Account Balance	$ 23,166	$ 23,581	$ 23,166	$ 23,581
Interest credited	223	189	647	468
Insurance, Other | Americas [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Policyholder Account Balance	17,515	19,227	17,515	19,227	$ 18,906	$ 18,758
Policyholder Account Balance Reinsurance Recoverable	(1,501)	(1,545)	(1,501)	(1,545)
Policyholder Account Balance, Issuance			84	1,249
Policyholder Account Balance, Policy Charge			(26)	(25)
Policyholder Account Balance, Surrender and Withdrawal			(1,517)	(870)
Policyholder Account Balance, Benefit Payment			(357)	(337)
Interest credited			425	452
Policyholder Account Balance Foreign Currency Translation			0	0
Policyholder Account Balance After Reinsurance	16,014	17,682	16,014	17,682
Insurance, Other | Asia Pacific [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Policyholder Account Balance	3,978	2,593	3,978	2,593	3,351	1,621
Policyholder Account Balance Reinsurance Recoverable	0	0	0	0
Policyholder Account Balance, Issuance			765	1,750
Policyholder Account Balance, Policy Charge			(5)	(126)
Policyholder Account Balance, Surrender and Withdrawal			(93)	(585)
Policyholder Account Balance, Benefit Payment			(79)	(30)
Interest credited			82	29
Policyholder Account Balance Foreign Currency Translation			(43)	66
Policyholder Account Balance After Reinsurance	3,978	2,593	3,978	2,593
Life Insurance Product Line [Member] | Americas [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Policyholder Account Balance	1,622	1,690	1,622	1,690	1,683	1,719
Policyholder Account Balance Reinsurance Recoverable	0	0	0	0
Policyholder Account Balance, Issuance			20	22
Policyholder Account Balance, Policy Charge			(23)	(24)
Policyholder Account Balance, Surrender and Withdrawal			(11)	(13)
Policyholder Account Balance, Benefit Payment			(96)	(63)
Interest credited			49	49
Policyholder Account Balance Foreign Currency Translation			0	0
Policyholder Account Balance After Reinsurance	$ 1,622	$ 1,690	$ 1,622	$ 1,690
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