Accounting Changes and Error Corrections (Narrative) (Details) - USD ($) $ in Millions		Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021	Jan. 01, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future policy benefits		$ 36,474	$ 35,689	$ 33,724
Life Insurance Product Line [Member] | Americas [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future policy benefits		9,257		9,190
Insurance, Other | Americas [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future policy benefits		$ 4,456		$ 3,827
Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future policy benefits			35,689		$ 47,449
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Americas [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future policy benefits			9,474		14,042	$ 17,632
Accounting Standards Update 2018-12 | Insurance, Other | Americas [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future policy benefits			3,819		4,947	5,883
Revision of Prior Period, Accounting Standards Update, Adjustment | Accounting Standards Update 2018-12 | Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future policy benefits						(1,746)
Revision of Prior Period, Change in Accounting Principle, Adjustment | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future policy benefits			$ 469		$ 11,667
Revision of Prior Period, Change in Accounting Principle, Adjustment | Accounting Standards Update 2018-12 | Retained Earnings [Member] | Life Insurance Product Line [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future policy benefits						1,462
Revision of Prior Period, Change in Accounting Principle, Adjustment | Accounting Standards Update 2018-12 | Retained Earnings [Member] | Life Insurance Product Line [Member] | Americas [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future policy benefits	[1]					896
Revision of Prior Period, Change in Accounting Principle, Adjustment | Accounting Standards Update 2018-12 | Retained Earnings [Member] | Insurance, Other | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future policy benefits						284
Revision of Prior Period, Change in Accounting Principle, Adjustment | Accounting Standards Update 2018-12 | Retained Earnings [Member] | Insurance, Other | Americas [Member] | Other Segments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Future policy benefits	[2]					$ 0

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

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