Policyholder Account Balances (Account Balances) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Policyholder Account Balance [Line Items]
Policyholder Account Balance		$ 22,586	$ 23,911
Interest credited		254	215
Policyholder Account Balance, Increase (Decrease) from Other Change		48	70
Life Insurance Product Line [Member] | Americas [Member] | Other Segments
Policyholder Account Balance [Line Items]
Policyholder Account Balance		1,595	1,646	$ 1,612	$ 1,683
Policyholder Account Balance, Issuance		3	3
Policyholder Account Balance, Policy Charge		(8)	(8)
Policyholder Account Balance, Surrender and Withdrawal		(2)	(5)
Policyholder Account Balance, Benefit Payment		(26)	(43)
Interest credited		16	16
Policyholder Account Balance Foreign Currency Translation		0	0
Policyholder Account Balance Reinsurance Recoverable		0	0
Policyholder Account Balance After Reinsurance		1,595	1,646
Policyholder Account Balance, Net Amount at Risk	[1]	656	697
Policyholder Account Balance, Cash Surrender Value		$ 1,589	$ 1,635
Policyholder Account Balance, Weighted Average Crediting Rate		4.40%	4.00%
Insurance, Other | Americas [Member] | Other Segments
Policyholder Account Balance [Line Items]
Policyholder Account Balance		$ 17,251	$ 18,437	17,838	18,906
Policyholder Account Balance, Issuance		29	41
Policyholder Account Balance, Policy Charge		(20)	(8)
Policyholder Account Balance, Surrender and Withdrawal		(609)	(528)
Policyholder Account Balance, Benefit Payment		(129)	(116)
Interest credited		142	142
Policyholder Account Balance Foreign Currency Translation		0	0
Policyholder Account Balance Reinsurance Recoverable		(2,975)	(1,532)
Policyholder Account Balance After Reinsurance		14,276	16,905
Policyholder Account Balance, Net Amount at Risk	[1]	6,999	2,468
Policyholder Account Balance, Cash Surrender Value		$ 17,130	$ 18,398
Policyholder Account Balance, Weighted Average Crediting Rate		3.40%	3.30%
Insurance, Other | Asia Pacific [Member] | Other Segments
Policyholder Account Balance [Line Items]
Policyholder Account Balance		$ 3,692	$ 3,758	$ 3,990	$ 3,351
Policyholder Account Balance, Issuance		211	431
Policyholder Account Balance, Policy Charge		(28)	0
Policyholder Account Balance, Surrender and Withdrawal		(221)	(19)
Policyholder Account Balance, Benefit Payment		(254)	(22)
Interest credited		27	32
Policyholder Account Balance Foreign Currency Translation		(33)	(15)
Policyholder Account Balance Reinsurance Recoverable		0	0
Policyholder Account Balance After Reinsurance		3,692	3,758
Policyholder Account Balance, Net Amount at Risk	[1]	0	0
Policyholder Account Balance, Cash Surrender Value		$ 3,256	$ 3,340
Policyholder Account Balance, Weighted Average Crediting Rate		3.00%	2.90%

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