Policyholder Account Balances (Account Balances) (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
Policyholder Account Balance [Line Items]
Policyholder Account Balance		$ 23,166	$ 23,581	$ 23,166	$ 23,581
Interest credited		223	189	647	468
Policyholder Account Balance, Increase (Decrease) from Other Change				51	71
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		1,622	1,690	1,622	1,690	1,683	1,719
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 Reinsurance Recoverable		0	0	0	0
Policyholder Account Balance After Reinsurance		1,622	1,690	1,622	1,690
Policyholder Account Balance, Net Amount at Risk	[1]	664	681	664	681
Policyholder Account Balance, Cash Surrender Value		$ 1,608	$ 1,675	$ 1,608	$ 1,675
Policyholder Account Balance, Weighted Average Crediting Rate		4.40%	4.00%	4.40%	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		$ 17,515	$ 19,227	$ 17,515	$ 19,227	18,906	18,758
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 Reinsurance Recoverable		(1,501)	(1,545)	(1,501)	(1,545)
Policyholder Account Balance After Reinsurance		16,014	17,682	16,014	17,682
Policyholder Account Balance, Net Amount at Risk	[1]	2,410	2,532	2,410	2,532
Policyholder Account Balance, Cash Surrender Value		$ 17,479	$ 19,166	$ 17,479	$ 19,166
Policyholder Account Balance, Weighted Average Crediting Rate		3.30%	3.20%	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		$ 3,978	$ 2,593	$ 3,978	$ 2,593	3,351	1,621
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 Reinsurance Recoverable		0	0	0	0
Policyholder Account Balance After Reinsurance		3,978	2,593	3,978	2,593
Policyholder Account Balance, Net Amount at Risk	[1]	0	0	0	0
Policyholder Account Balance, Cash Surrender Value		$ 3,760	$ 2,468	$ 3,760	$ 2,468
Policyholder Account Balance, Weighted Average Crediting Rate		3.00%	2.20%	3.00%	2.20%
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

[1] The Net amount at risk is defined as the guarantee amount less the account value as of the balance sheet date. The balance represents the amount of the claim that the Company would incur if death claims were filed on all contracts on the balance sheet date.