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Future Policy Benefits (Undiscounted and Discounted) (Details) - Other Segments - USD ($) $ in Millions | Jun. 30, 2024 | Jun. 30, 2023
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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 | $ 80,236 | $ 81,058
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 185,828 | 181,424
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 78,176 | 79,289
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 177,026 | 172,520
Americas [Member] | Insurance, Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance | 1,774 | 1,912
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 14,431 | 9,066
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 8,380 | 5,231
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 2,865 | 3,062
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 | 21,578 | 22,193
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 56,587 | 58,011
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 21,631 | 22,163
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 54,822 | 55,059
CANADA | Insurance, Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance | 4,002 | 3,141
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 17,846 | 4,608
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 7,772 | 3,051
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 6,341 | 4,749
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 | 14,357 | 13,178
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 26,138 | 24,714
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 13,714 | 12,416
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 26,345 | 25,185
EMEA [Member] | Insurance, Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance | 57,128 | 36,502
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 114,188 | 70,992
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 58,308 | 38,281
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 111,756 | 67,116
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 | 38,402 | 38,197
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 92,090 | 87,425
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 32,711 | 32,586
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 96,035 | 91,057
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 | 2,660 | 3,257
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 17,653 | 10,844
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 11,171 | 7,778
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | $ 3,578 | $ 3,939

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