Future Policy Benefits (Premiums and Interest) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Gross Premium Income	$ 13,771	$ 11,967
Liability for Future Policy Benefit, Interest Expense	1,387	1,282
Life Insurance Product Line [Member] | Americas [Member] | Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Gross Premium Income	6,093	5,980
Liability for Future Policy Benefit, Interest Expense	549	517
Life Insurance Product Line [Member] | Canada Segment Reporting Information [Member] | Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Gross Premium Income	1,096	1,101
Liability for Future Policy Benefit, Interest Expense	212	210
Life Insurance Product Line [Member] | EMEA [Member] | Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Gross Premium Income	1,422	1,343
Liability for Future Policy Benefit, Interest Expense	40	30
Life Insurance Product Line [Member] | Asia Pacific [Member] | Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Gross Premium Income	2,655	2,552
Liability for Future Policy Benefit, Interest Expense	153	139
Insurance, Other [Member] | Americas [Member] | Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Gross Premium Income	1,496	38
Liability for Future Policy Benefit, Interest Expense	190	179
Insurance, Other [Member] | Canada Segment Reporting Information [Member] | Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Gross Premium Income	90	95
Liability for Future Policy Benefit, Interest Expense	2	3
Insurance, Other [Member] | EMEA [Member] | Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Gross Premium Income	701	622
Liability for Future Policy Benefit, Interest Expense	178	158
Insurance, Other [Member] | Asia Pacific [Member] | Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Gross Premium Income	218	236
Liability for Future Policy Benefit, Interest Expense	$ 63	$ 46