Accounting Changes and Error Corrections (DAC) (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	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs	$ 4,257	$ 3,906	$ 4,128
Life Insurance Product Line [Member] | Americas [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [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] | CANADA | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [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] | EMEA [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [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] | Asia Pacific [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [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)
Insurance, Other | Americas [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [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 | CANADA | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [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] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [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 | Asia Pacific [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [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
Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs			4,128	3,860
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Americas [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [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
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | CANADA | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [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
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | EMEA [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [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)
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Asia Pacific [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [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)
Accounting Standards Update 2018-12 | Insurance, Other | Americas [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [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
Accounting Standards Update 2018-12 | Insurance, Other | CANADA | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [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
Accounting Standards Update 2018-12 | Insurance, Other | EMEA [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [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
Accounting Standards Update 2018-12 | Insurance, Other | Asia Pacific [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [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)
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Life Insurance Product Line [Member] | Americas [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs						$ 0
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Life Insurance Product Line [Member] | CANADA | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs						0
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Life Insurance Product Line [Member] | EMEA [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs						0
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Life Insurance Product Line [Member] | Asia Pacific [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs						0
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Insurance, Other | Americas [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs						114
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Insurance, Other | CANADA | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs						0
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Insurance, Other | EMEA [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs						0
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Insurance, Other | Asia Pacific [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs						0
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Life Insurance Product Line [Member] | Americas [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs						1,816
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Life Insurance Product Line [Member] | CANADA | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs						195
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Life Insurance Product Line [Member] | EMEA [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs						264
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Life Insurance Product Line [Member] | Asia Pacific [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs						1,046
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Insurance, Other | Americas [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs						368
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Insurance, Other | CANADA | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs						0
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Insurance, Other | EMEA [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs						0
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Insurance, Other | Asia Pacific [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs						41
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Original Balance | Life Insurance Product Line [Member] | Americas [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs						1,816
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Original Balance | Life Insurance Product Line [Member] | CANADA | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs						195
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Original Balance | Life Insurance Product Line [Member] | EMEA [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs						264
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Original Balance | Life Insurance Product Line [Member] | Asia Pacific [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs						1,046
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Original Balance | Insurance, Other | Americas [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs						254
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Original Balance | Insurance, Other | CANADA | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs						0
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Original Balance | Insurance, Other | EMEA [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs						0
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Original Balance | Insurance, Other | Asia Pacific [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs						$ 41