Future Policy Benefits (Premiums and Interest) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Interest Expense	$ 2,218	$ 1,838
Liability for Future Policy Benefit, Gross Premium Income	12,342	10,840
Americas [Member] \| Life Insurance Product Line [Member] \| Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Interest Expense	546	539
Liability for Future Policy Benefit, Gross Premium Income	4,776	4,791
Americas [Member] \| Insurance, Other \| Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Interest Expense	401	366
Liability for Future Policy Benefit, Gross Premium Income	1,162	177
CANADA \| Life Insurance Product Line [Member] \| Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Interest Expense	167	160
Liability for Future Policy Benefit, Gross Premium Income	869	831
CANADA \| Insurance, Other \| Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Interest Expense	169	164
Liability for Future Policy Benefit, Gross Premium Income	135	143
EMEA [Member] \| Life Insurance Product Line [Member] \| Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Interest Expense	43	35
Liability for Future Policy Benefit, Gross Premium Income	1,385	1,341
EMEA [Member] \| Insurance, Other \| Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Interest Expense	312	220
Liability for Future Policy Benefit, Gross Premium Income	1,064	897
Asia Pacific [Member] \| Life Insurance Product Line [Member] \| Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Interest Expense	145	134
Liability for Future Policy Benefit, Gross Premium Income	2,420	2,335
Asia Pacific [Member] \| Insurance, Other \| Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Interest Expense	435	220
Liability for Future Policy Benefit, Gross Premium Income	$ 531	$ 325