Accounting Changes and Error Corrections (Impact by Segment) (Details) - USD ($) $ in Millions		Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits		$ 38,239	$ 35,689	$ 37,028
Deferred policy acquisition costs		4,286	4,128	3,935
Life Insurance Product Line [Member] | Americas [Member] | Other Segments
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		(407)		(482)
Liability for Future Policy Benefit, after Reinsurance		9,385		9,662
Future policy benefits		9,792		10,144
Deferred policy acquisition costs		2,134	2,087	2,007	$ 1,947
Life Insurance Product Line [Member] | CANADA | Other Segments
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		(285)		(279)
Liability for Future Policy Benefit, after Reinsurance		3,995		3,838
Future policy benefits		4,280		4,117
Deferred policy acquisition costs		174	171	185	191
Life Insurance Product Line [Member] | EMEA [Member] | Other Segments
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		(36)		(30)
Liability for Future Policy Benefit, after Reinsurance		1,012		1,050
Future policy benefits		1,048		1,080
Deferred policy acquisition costs		318	294	272	270
Life Insurance Product Line [Member] | Asia Pacific [Member] | Other Segments
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		(99)		(98)
Liability for Future Policy Benefit, after Reinsurance		2,367		2,107
Future policy benefits		2,466		2,205
Deferred policy acquisition costs		1,050	1,043	1,041	1,056
Insurance, Other | Americas [Member] | Other Segments
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		0		0
Liability for Future Policy Benefit, after Reinsurance		3,885		4,106
Future policy benefits		3,885		4,106
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change		(16)	263	12	248
Market Risk Benefit, Reinsurance Recoverable, after Allowance				0
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change		229	247	271	262
Deferred policy acquisition costs		320	341	308	312
Insurance, Other | CANADA | Other Segments
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		0		0
Liability for Future Policy Benefit, after Reinsurance		53		62
Future policy benefits		53		62
Deferred policy acquisition costs		0	0	0	0
Insurance, Other | EMEA [Member] | Other Segments
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		0		0
Liability for Future Policy Benefit, after Reinsurance		5,110		4,913
Future policy benefits		5,110		4,913
Deferred policy acquisition costs		0	0	0	0
Insurance, Other | Asia Pacific [Member] | Other Segments
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		0		0
Liability for Future Policy Benefit, after Reinsurance		5,611		4,576
Future policy benefits		5,611		4,576
Deferred policy acquisition costs		$ 285	188	$ 116	81
Accounting Standards Update 2018-12
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits			35,689		47,449
Deferred policy acquisition costs			4,128		3,860
Accounting Standards Update 2018-12 | Previously Reported
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits			35,220		35,782
Deferred policy acquisition costs			3,974		3,690
Accounting Standards Update 2018-12 | Revision of Prior Period, Change in Accounting Principle, Adjustment
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits			469		11,667
Deferred policy acquisition costs			154		170
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Retained Earnings [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits						$ 1,462
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Americas [Member] | Other Segments
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance			(421)		(697)	(1,123)
Liability for Future Policy Benefit, after Reinsurance			9,053		13,345	16,509
Future policy benefits			9,474		14,042	17,632
Deferred policy acquisition costs			2,087		1,947
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Americas [Member] | Other Segments | Previously Reported
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits						10,444
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Americas [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Retained Earnings [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits	[1]					896
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Americas [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Reclassification of Claims and Benefits payable
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits	[2]					1,750
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Americas [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Effect Of Changes In Discount Rate Assumptions
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits						4,542
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | CANADA | Other Segments
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance			(265)		(367)	(386)
Liability for Future Policy Benefit, after Reinsurance			3,686		5,188	5,978
Future policy benefits			3,951		5,555	6,364
Deferred policy acquisition costs			171		191
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | CANADA | Other Segments | Previously Reported
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits						3,477
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | CANADA | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Retained Earnings [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits	[1]					33
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | CANADA | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Reclassification of Claims and Benefits payable
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits	[2]					203
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | CANADA | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Effect Of Changes In Discount Rate Assumptions
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits						2,651
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | EMEA [Member] | Other Segments
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance			(31)		(34)	(85)
Liability for Future Policy Benefit, after Reinsurance			1,010		1,355	2,585
Future policy benefits			1,041		1,389	2,670
Deferred policy acquisition costs			294		270
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | EMEA [Member] | Other Segments | Previously Reported
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits						1,379
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | EMEA [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Retained Earnings [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits	[1]					70
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | EMEA [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Reclassification of Claims and Benefits payable
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits	[2]					901
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | EMEA [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Effect Of Changes In Discount Rate Assumptions
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits						320
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Asia Pacific [Member] | Other Segments
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance			(100)		(116)	(212)
Liability for Future Policy Benefit, after Reinsurance			2,248		2,895	4,207
Future policy benefits			2,348		3,011	4,419
Deferred policy acquisition costs			1,043		1,056
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Asia Pacific [Member] | Other Segments | Previously Reported
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits						3,568
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Asia Pacific [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Retained Earnings [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits	[1]					463
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Asia Pacific [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Reclassification of Claims and Benefits payable
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits	[2]					1,160
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Asia Pacific [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Effect Of Changes In Discount Rate Assumptions
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits						(772)
Accounting Standards Update 2018-12 | Insurance, Other | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Retained Earnings [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits						284
Accounting Standards Update 2018-12 | Insurance, Other | Americas [Member] | Other Segments
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance			0		0	0
Liability for Future Policy Benefit, after Reinsurance			3,819		4,947	5,883
Future policy benefits			3,819		4,947	5,883
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change			263		254	266	$ 311
Market Risk Benefit, Reinsurance Recoverable, after Allowance			0		0	0
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change			247		262	266	$ 266
Deferred policy acquisition costs			341		312	368
Accounting Standards Update 2018-12 | Insurance, Other | Americas [Member] | Other Segments | Previously Reported
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits						5,037
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change						0
Deferred policy acquisition costs						254
Accounting Standards Update 2018-12 | Insurance, Other | Americas [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Retained Earnings [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits	[3]					0
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change						72
Accounting Standards Update 2018-12 | Insurance, Other | Americas [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | AOCI Attributable to Parent [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits	[4]					(28)
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change						(45)
Deferred policy acquisition costs						114
Accounting Standards Update 2018-12 | Insurance, Other | Americas [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Reclassification of Claims and Benefits payable
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits	[5]					17
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change						239
Accounting Standards Update 2018-12 | Insurance, Other | Americas [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Effect Of Changes In Discount Rate Assumptions
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits						857
Accounting Standards Update 2018-12 | Insurance, Other | CANADA | Other Segments
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance			0		0	0
Liability for Future Policy Benefit, after Reinsurance			54		81	49
Future policy benefits			54		81	49
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change						0
Market Risk Benefit, Reinsurance Recoverable, after Allowance						0
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change						0
Deferred policy acquisition costs			0		0	0
Accounting Standards Update 2018-12 | Insurance, Other | CANADA | Other Segments | Previously Reported
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits						16
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change						0
Deferred policy acquisition costs						0
Accounting Standards Update 2018-12 | Insurance, Other | CANADA | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Retained Earnings [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits	[3]					20
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change						0
Accounting Standards Update 2018-12 | Insurance, Other | CANADA | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | AOCI Attributable to Parent [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits	[4]					0
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change						0
Deferred policy acquisition costs						0
Accounting Standards Update 2018-12 | Insurance, Other | CANADA | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Reclassification of Claims and Benefits payable
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits	[5]					4
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change						0
Accounting Standards Update 2018-12 | Insurance, Other | CANADA | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Effect Of Changes In Discount Rate Assumptions
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits						9
Accounting Standards Update 2018-12 | Insurance, Other | EMEA [Member] | Other Segments
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance			0		0	0
Liability for Future Policy Benefit, after Reinsurance			4,634		6,729	6,991
Future policy benefits			4,634		6,729	6,991
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change						0
Market Risk Benefit, Reinsurance Recoverable, after Allowance						0
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change						0
Deferred policy acquisition costs			0		0	0
Accounting Standards Update 2018-12 | Insurance, Other | EMEA [Member] | Other Segments | Previously Reported
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits						5,657
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change						0
Deferred policy acquisition costs						0
Accounting Standards Update 2018-12 | Insurance, Other | EMEA [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Retained Earnings [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits	[3]					256
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change						0
Accounting Standards Update 2018-12 | Insurance, Other | EMEA [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | AOCI Attributable to Parent [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits	[4]					0
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change						0
Deferred policy acquisition costs						0
Accounting Standards Update 2018-12 | Insurance, Other | EMEA [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Reclassification of Claims and Benefits payable
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits	[5]					67
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change						0
Accounting Standards Update 2018-12 | Insurance, Other | EMEA [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Effect Of Changes In Discount Rate Assumptions
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits						1,011
Accounting Standards Update 2018-12 | Insurance, Other | Asia Pacific [Member] | Other Segments
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance			0		0	0
Liability for Future Policy Benefit, after Reinsurance			4,496		5,014	1,887
Future policy benefits			4,496		5,014	1,887
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change						0
Market Risk Benefit, Reinsurance Recoverable, after Allowance						0
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change						0
Deferred policy acquisition costs			$ 188		$ 81	41
Accounting Standards Update 2018-12 | Insurance, Other | Asia Pacific [Member] | Other Segments | Previously Reported
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits						1,874
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change						0
Deferred policy acquisition costs						41
Accounting Standards Update 2018-12 | Insurance, Other | Asia Pacific [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Retained Earnings [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits	[3]					8
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change						0
Accounting Standards Update 2018-12 | Insurance, Other | Asia Pacific [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | AOCI Attributable to Parent [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits	[4]					0
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change						0
Deferred policy acquisition costs						0
Accounting Standards Update 2018-12 | Insurance, Other | Asia Pacific [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Reclassification of Claims and Benefits payable
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits	[5]					2
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change						0
Accounting Standards Update 2018-12 | Insurance, Other | Asia Pacific [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Effect Of Changes In Discount Rate Assumptions
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits						$ 3

[1] Includes adjustments for capping the net premium ratio at 100% and eliminating negative reserves on certain issue year cohorts.

[2] Amount includes certain reclassifications to conform with the revised presentation upon adoption of ASU 2018-12, such as reclassifying claims and benefits payable on long-duration contracts to liability for future policy benefits.

[3] Includes adjustments for capping the net premium ratio at 100% and eliminating negative reserves on certain issue year cohorts.

[4] Adjustment to remove amounts associated with unrealized gains and losses previously recorded in AOCI (i.e., “shadow adjustments”).

[5] Amount includes certain reclassifications to conform with the revised presentation upon adoption of ASU 2018-12, such as reclassifying claims and benefits payable on long-duration contracts to liability for future policy benefits.