Deferred Policy Acquisition Costs (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2021
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	$ 4,257	$ 3,906	$ 4,128
Corporate and Other [Member]
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	5	5
Accounting Standards Update 2018-12
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs			4,128	$ 3,860
Life Insurance Product Line [Member] | Americas [Member] | Other Segments
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	2,109	1,981	2,087	1,947
Deferred Policy Acquisition Cost, Capitalization	57	70
Deferred Policy Acquisition Costs, Amortization Expense	(35)	(36)
Deferred Policy Acquisition Costs, Foreign Currency Translation Gain (Loss)	0	0
Life Insurance Product Line [Member] | Americas [Member] | Accounting Standards Update 2018-12 | Other Segments
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs			2,087	1,947
Deferred Policy Acquisition Cost, Capitalization			284	254
Deferred Policy Acquisition Costs, Amortization Expense			(144)	(123)
Deferred Policy Acquisition Costs, Foreign Currency Translation Gain (Loss)			0	0
Life Insurance Product Line [Member] | CANADA | Other Segments
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	171	192	171	191
Deferred Policy Acquisition Cost, Capitalization	3	2
Deferred Policy Acquisition Costs, Amortization Expense	(3)	(3)
Deferred Policy Acquisition Costs, Foreign Currency Translation Gain (Loss)	0	2
Life Insurance Product Line [Member] | CANADA | Accounting Standards Update 2018-12 | Other Segments
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs			171	191
Deferred Policy Acquisition Cost, Capitalization			10	8
Deferred Policy Acquisition Costs, Amortization Expense			(17)	(13)
Deferred Policy Acquisition Costs, Foreign Currency Translation Gain (Loss)			(13)	1
Life Insurance Product Line [Member] | EMEA [Member] | Other Segments
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	309	278	294	270
Deferred Policy Acquisition Cost, Capitalization	25	15
Deferred Policy Acquisition Costs, Amortization Expense	(10)	(11)
Deferred Policy Acquisition Costs, Foreign Currency Translation Gain (Loss)	0	4
Life Insurance Product Line [Member] | EMEA [Member] | Accounting Standards Update 2018-12 | Other Segments
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs			294	270
Deferred Policy Acquisition Cost, Capitalization			83	42
Deferred Policy Acquisition Costs, Amortization Expense			(38)	(24)
Deferred Policy Acquisition Costs, Foreign Currency Translation Gain (Loss)			(21)	(12)
Life Insurance Product Line [Member] | Asia Pacific [Member] | Other Segments
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	1,044	1,061	1,043	1,056
Deferred Policy Acquisition Cost, Capitalization	19	34
Deferred Policy Acquisition Costs, Amortization Expense	(15)	(23)
Deferred Policy Acquisition Costs, Foreign Currency Translation Gain (Loss)	(3)	(6)
Life Insurance Product Line [Member] | Asia Pacific [Member] | Accounting Standards Update 2018-12 | Other Segments
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs			1,043	1,056
Deferred Policy Acquisition Cost, Capitalization			86	83
Deferred Policy Acquisition Costs, Amortization Expense			(67)	(55)
Deferred Policy Acquisition Costs, Foreign Currency Translation Gain (Loss)			(32)	(18)
Insurance, Other | Americas [Member] | Other Segments
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	330	298	341	312
Deferred Policy Acquisition Cost, Capitalization	0	6
Deferred Policy Acquisition Costs, Amortization Expense	(11)	(20)
Deferred Policy Acquisition Costs, Foreign Currency Translation Gain (Loss)	0	0
Insurance, Other | Americas [Member] | Accounting Standards Update 2018-12 | Other Segments
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs			341	312	$ 368
Deferred Policy Acquisition Cost, Capitalization			87	8
Deferred Policy Acquisition Costs, Amortization Expense			(58)	(64)
Deferred Policy Acquisition Costs, Foreign Currency Translation Gain (Loss)			0	0
Insurance, Other | CANADA | Other Segments
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	0	0	0	0
Deferred Policy Acquisition Cost, Capitalization	0	0
Deferred Policy Acquisition Costs, Amortization Expense	0	0
Deferred Policy Acquisition Costs, Foreign Currency Translation Gain (Loss)	0	0
Insurance, Other | CANADA | Accounting Standards Update 2018-12 | Other Segments
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs			0	0	0
Deferred Policy Acquisition Cost, Capitalization			0	0
Deferred Policy Acquisition Costs, Amortization Expense			0	0
Deferred Policy Acquisition Costs, Foreign Currency Translation Gain (Loss)			0	0
Insurance, Other | EMEA [Member] | Other Segments
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	0	0	0	0
Deferred Policy Acquisition Cost, Capitalization	0	0
Deferred Policy Acquisition Costs, Amortization Expense	0	0
Deferred Policy Acquisition Costs, Foreign Currency Translation Gain (Loss)	0	0
Insurance, Other | EMEA [Member] | Accounting Standards Update 2018-12 | Other Segments
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs			0	0	0
Deferred Policy Acquisition Cost, Capitalization			0	0
Deferred Policy Acquisition Costs, Amortization Expense			0	0
Deferred Policy Acquisition Costs, Foreign Currency Translation Gain (Loss)			0	0
Insurance, Other | Asia Pacific [Member] | Other Segments
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs	289	91	188	81
Deferred Policy Acquisition Cost, Capitalization	108	13
Deferred Policy Acquisition Costs, Amortization Expense	(6)	(3)
Deferred Policy Acquisition Costs, Foreign Currency Translation Gain (Loss)	$ (1)	$ 0
Insurance, Other | Asia Pacific [Member] | Accounting Standards Update 2018-12 | Other Segments
Deferred Policy Acquisition Cost [Line Items]
Deferred policy acquisition costs			188	81	$ 41
Deferred Policy Acquisition Cost, Capitalization			121	49
Deferred Policy Acquisition Costs, Amortization Expense			(13)	(8)
Deferred Policy Acquisition Costs, Foreign Currency Translation Gain (Loss)			$ (1)	$ (1)