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Supplementary Insurance Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Deferred Policy Acquisition Cost |  | $ 3,397,770 | $ 3,239,824 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Liability for Future Policy Benefit, Loss, Claim and Loss Expense |  | 43,289,926 | 38,590,883 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Policy Claim and Benefit Payable |  | 5,642,755 | 4,992,074 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Premium Revenue |  | 10,543,776 | 9,841,130 | $ 9,248,871
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Net Investment Income |  | 2,138,525 | 2,154,651 | 1,911,886
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Benefit, Claim, Loss and Settlement Expenses |  | 9,744,133 | 9,020,957 | 8,358,066
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Amortization of Deferred Policy Acquisition Cost |  | 423,038 | 502,866 | 381,192
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Operating Expense | [1] | 1,862,673 | 1,849,131 | 1,738,307
US Traditional Segment Reporting Information [Member] |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Deferred Policy Acquisition Cost |  | 1,824,874 | 1,818,572 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Liability for Future Policy Benefit, Loss, Claim and Loss Expense |  | 11,727,505 | 11,343,921 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Policy Claim and Benefit Payable |  | 1,948,335 | 1,814,018 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Premium Revenue |  | 5,533,256 | 5,356,321 | 5,249,571
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Net Investment Income |  | 729,757 | 728,073 | 699,833
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Benefit, Claim, Loss and Settlement Expenses |  | 5,130,795 | 4,842,412 | 4,717,850
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Amortization of Deferred Policy Acquisition Cost |  | 180,407 | 191,725 | 177,255
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Operating Expense | [1] | 698,121 | 692,600 | 698,762
US Non-Traditional Segment Reporting Information [Member] |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Deferred Policy Acquisition Cost |  | 420,154 | 405,623 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Liability for Future Policy Benefit, Loss, Claim and Loss Expense |  | 19,420,906 | 15,127,529 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Policy Claim and Benefit Payable |  | 20,855 | 17,876 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Premium Revenue |  | 27,203 | 23,683 | 24,349
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Net Investment Income |  | 706,624 | 778,473 | 631,097
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Benefit, Claim, Loss and Settlement Expenses |  | 442,071 | 458,368 | 333,107
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Amortization of Deferred Policy Acquisition Cost |  | 108,697 | 185,280 | 133,501
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Operating Expense | [1] | 105,999 | 105,146 | 90,458
Canada Traditional Segment Reporting Information [Member] |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Deferred Policy Acquisition Cost |  | 192,661 | 212,345 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Liability for Future Policy Benefit, Loss, Claim and Loss Expense |  | 2,929,568 | 3,041,790 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Policy Claim and Benefit Payable |  | 182,343 | 206,655 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Premium Revenue |  | 1,024,021 | 901,976 | 928,642
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Net Investment Income |  | 199,412 | 189,018 | 178,927
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Benefit, Claim, Loss and Settlement Expenses |  | 847,828 | 757,912 | 707,428
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Amortization of Deferred Policy Acquisition Cost |  | 13,097 | 12,426 | 10,621
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Operating Expense | [1] | 251,171 | 212,964 | 265,250
Canada Non-Traditional Segment Reporting Information [Member] |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Deferred Policy Acquisition Cost |  | 0 | 0 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Liability for Future Policy Benefit, Loss, Claim and Loss Expense |  | 25,574 | 27,908 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Policy Claim and Benefit Payable |  | 34,471 | 1,040 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Premium Revenue |  | 43,372 | 38,229 | 38,701
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Net Investment Income |  | 1,334 | 5,115 | 2,692
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Benefit, Claim, Loss and Settlement Expenses |  | 36,808 | 29,639 | 36,275
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Amortization of Deferred Policy Acquisition Cost |  | 0 | 0 | 0
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Operating Expense | [1] | 2,204 | 2,656 | 2,718
EMEA Traditional Segment Reporting Information [Member] |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Deferred Policy Acquisition Cost |  | 239,161 | 229,150 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Liability for Future Policy Benefit, Loss, Claim and Loss Expense |  | 1,110,194 | 1,075,786 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Policy Claim and Benefit Payable |  | 977,530 | 882,744 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Premium Revenue |  | 1,423,199 | 1,301,640 | 1,140,062
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Net Investment Income |  | 66,242 | 55,511 | 50,301
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Benefit, Claim, Loss and Settlement Expenses |  | 1,233,458 | 1,096,211 | 999,005
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Amortization of Deferred Policy Acquisition Cost |  | 26,915 | 20,570 | 33,795
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Operating Expense | [1] | 179,113 | 174,808 | 132,290
EMEA Non-Traditional Segment Reporting Information [Member] |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Deferred Policy Acquisition Cost |  | 0 | 0 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Liability for Future Policy Benefit, Loss, Claim and Loss Expense |  | 4,540,751 | 4,741,983 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Policy Claim and Benefit Payable |  | 34,514 | 38,044 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Premium Revenue |  | 195,333 | 163,720 | 180,271
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Net Investment Income |  | 133,855 | 123,258 | 125,282
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Benefit, Claim, Loss and Settlement Expenses |  | 116,492 | 153,874 | 178,014
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Amortization of Deferred Policy Acquisition Cost |  | 0 | 0 | 0
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Operating Expense | [1] | 37,007 | 33,683 | 24,497
Asia Pacific Traditional Segment Reporting Information [Member] |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Deferred Policy Acquisition Cost |  | 702,439 | 552,947 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Liability for Future Policy Benefit, Loss, Claim and Loss Expense |  | 1,738,199 | 1,611,633 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Policy Claim and Benefit Payable |  | 2,436,473 | 2,017,920 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Premium Revenue |  | 2,296,435 | 2,053,029 | 1,681,505
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Net Investment Income |  | 95,521 | 91,675 | 83,049
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Benefit, Claim, Loss and Settlement Expenses |  | 1,885,355 | 1,635,728 | 1,345,951
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Amortization of Deferred Policy Acquisition Cost |  | 92,231 | 91,477 | 24,597
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Operating Expense | [1] | 261,761 | 334,695 | 286,674
Asia Pacific Non-Traditional Segment Reporting Information [Member] |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Deferred Policy Acquisition Cost |  | 18,481 | 21,187 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Liability for Future Policy Benefit, Loss, Claim and Loss Expense |  | 1,043,375 | 1,118,012 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Policy Claim and Benefit Payable |  | 2,365 | 6,885 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Premium Revenue |  | 866 | 2,419 | 5,428
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Net Investment Income |  | 40,729 | 34,529 | 23,648
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Benefit, Claim, Loss and Settlement Expenses |  | 39,726 | 40,467 | 37,976
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Amortization of Deferred Policy Acquisition Cost |  | 1,691 | 1,388 | 1,423
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Operating Expense | [1] | 19,028 | 18,790 | 19,920
Corporate And Other Segment Reporting Information [Member] |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Deferred Policy Acquisition Cost |  | 0 | 0 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Liability for Future Policy Benefit, Loss, Claim and Loss Expense |  | 753,854 | 502,321 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Policy Claim and Benefit Payable |  | 5,869 | 6,892 |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Premium Revenue |  | 91 | 113 | 342
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Net Investment Income |  | 165,051 | 148,999 | 117,057
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Benefit, Claim, Loss and Settlement Expenses |  | 11,600 | 6,346 | 2,460
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Amortization of Deferred Policy Acquisition Cost |  | 0 | 0 | 0
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Operating Expense | [1] | $ 308,269 | $ 273,789 | $ 217,738
[1] | Includes policy acquisition costs and other insurance expenses, excluding amortization of DAC. Also includes other operating expenses, interest expense, and collateral finance and securitization expense.

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