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Investments (Investments in Fixed Maturity and Equity Securities Available-for-Sale by Sector) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 22,249,964 | $ 21,966,803
Estimated Fair Value | $ 22,503,507 | $ 23,210,968
% of Total | 100.00% | 100.00%
Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 35,233,970 | $ 35,281,412
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2,143,192 | 2,982,754
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 592,208 | 113,346
Estimated Fair Value | $ 36,784,954 | $ 38,150,820
% of Total | 100.00% | 100.00%
Other-than-temporary impairments in AOCI | $ 275 | $ 275
Equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 102,841
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 958
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 3,647
Estimated Fair Value |  | $ 100,152
% of Total |  | 100.00%
Corporate Debt Securities [Member] | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 22,249,964 | $ 21,966,803
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 663,087 | 1,299,594
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 409,544 | 55,429
Estimated Fair Value | $ 22,503,507 | $ 23,210,968
% of Total | 61.20% | 60.90%
Other-than-temporary impairments in AOCI | $ 0 | $ 0
Canadian and Canadian provincial governments | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,789,699 | 2,843,273
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,277,020 | 1,378,510
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 3,876 | 1,707
Estimated Fair Value | $ 4,062,843 | $ 4,220,076
% of Total | 11.00% | 11.10%
Other-than-temporary impairments in AOCI | $ 0 | $ 0
Residential mortgage-backed securities | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,837,316 | 1,695,126
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 18,500 | 36,632
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 34,602 | 11,878
Estimated Fair Value | $ 1,821,214 | $ 1,719,880
% of Total | 5.00% | 4.50%
Other-than-temporary impairments in AOCI | $ 0 | $ 0
Asset-backed securities | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,711,099 | 1,634,758
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 11,596 | 18,798
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 13,871 | 5,194
Estimated Fair Value | $ 1,708,824 | $ 1,648,362
% of Total | 4.60% | 4.30%
Other-than-temporary impairments in AOCI | $ 275 | $ 275
Commercial Mortgage Backed Securities [Member] | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,249,616 | 1,285,594
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 8,591 | 22,627
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 15,698 | 4,834
Estimated Fair Value | $ 1,242,509 | $ 1,303,387
% of Total | 3.40% | 3.40%
Other-than-temporary impairments in AOCI | $ 0 | $ 0
US Treasury and Government [Member] | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,583,622 | 1,953,436
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 8,193 | 12,089
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 66,665 | 21,933
Estimated Fair Value | $ 1,525,150 | $ 1,943,592
% of Total | 4.10% | 5.10%
Other-than-temporary impairments in AOCI | $ 0 | $ 0
US States and Political Subdivisions Debt Securities [Member] | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 703,047 | 647,727
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 43,318 | 59,997
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 9,321 | 4,296
Estimated Fair Value | $ 737,044 | $ 703,428
% of Total | 2.00% | 1.80%
Other-than-temporary impairments in AOCI | $ 0 | $ 0
Debt Security, Government, Non-US [Member] | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 3,109,607 | 3,254,695
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 112,887 | 154,507
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 38,631 | 8,075
Estimated Fair Value | $ 3,183,863 | $ 3,401,127
% of Total | 8.70% | 8.90%
Other-than-temporary impairments in AOCI | $ 0 | $ 0
Nonredeemable Preferred Stock [Member] | Equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 41,553
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 479
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 2,226
Estimated Fair Value |  | $ 39,806
% of Total |  | 39.70%
Other equity securities | Equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | $ 61,288
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 479
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 1,421
Estimated Fair Value |  | $ 60,346
% of Total |  | 60.30%

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