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Future Policy Benefits (Undiscounted and Discounted) (Details) - Other Segments - USD ($) $ in Millions | Jun. 30, 2023 | Jun. 30, 2022
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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

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