Future Policy Benefits (Undiscounted and Discounted) (Details) - Other Segments - USD ($) $ in Millions	Jun. 30, 2025	Jun. 30, 2024
Americas [Member] | Life Insurance Product Line [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	$ 84,387	$ 80,236
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	196,697	185,828
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance	83,308	78,176
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	184,475	177,026
Americas [Member] | Insurance, Other
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	1,645	1,774
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	22,386	14,431
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance	10,816	8,380
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	2,601	2,865
CANADA | Life Insurance Product Line [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	21,992	21,578
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	56,871	56,587
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance	21,924	21,631
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	55,343	54,822
CANADA | Insurance, Other
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	3,864	4,002
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	18,137	17,846
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance	8,193	7,772
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	5,918	6,341
EMEA [Member] | Life Insurance Product Line [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	16,626	14,357
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	30,625	26,138
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance	16,197	13,714
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	30,549	26,345
EMEA [Member] | Insurance, Other
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	75,159	57,128
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	160,718	114,188
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance	82,029	58,308
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	148,624	111,756
Asia Pacific [Member] | Life Insurance Product Line [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	45,709	38,402
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	109,518	92,090
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance	38,866	32,711
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	113,413	96,035
Asia Pacific [Member] | Insurance, Other
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	3,778	2,660
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	30,889	17,653
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance	15,147	11,171
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	$ 5,507	$ 3,578