Future Policy Benefits (Undiscounted and Discounted) (Details) - Other Segments - USD ($) $ in Millions	Jun. 30, 2023	Jun. 30, 2022
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	$ 81,058	$ 84,638
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	181,424	181,945
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance	79,289	82,447
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	172,520	172,995
Americas [Member] | Insurance, Other
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	1,912	628
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	9,066	7,249
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance	5,231	4,233
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	3,062	956
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	22,193	20,908
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	58,011	57,185
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance	22,163	20,933
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	55,059	53,583
CANADA | Insurance, Other
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	3,141	3,428
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	4,608	5,139
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance	3,051	3,353
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	4,749	5,255
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	13,178	13,747
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	24,714	23,198
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance	12,416	12,948
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	25,185	23,736
EMEA [Member] | Insurance, Other
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	36,502	34,604
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	70,992	55,398
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance	38,281	36,272
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	67,116	52,745
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	38,197	34,636
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	87,425	80,108
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance	32,586	29,354
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	91,057	82,264
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	3,257	2,515
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	10,844	8,317
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance	7,778	6,254
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	$ 3,939	$ 2,949