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Investments (Investments in Fixed Maturity and Equity Securities Available-for-Sale by Sector) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 24,216,876 | $ 24,006,407
Estimated Fair Value | $ 25,077,338 | $ 23,982,119
% of Total | 100.00% | 100.00%
Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 39,188,627 | $ 38,882,168
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2,780,039 | 1,858,668
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 230,223 | 748,490
Estimated Fair Value | $ 41,738,443 | $ 39,992,346
% of Total | 100.00% | 100.00%
Other-than-temporary impairments in AOCI | $ 275 | $ 275
Corporate Debt Securities [Member] | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 24,216,876 | 24,006,407
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,024,557 | 530,804
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 164,095 | 555,092
Estimated Fair Value | $ 25,077,338 | $ 23,982,119
% of Total | 60.10% | 59.90%
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 | 2,870,018 | 2,768,466
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,408,501 | 1,126,227
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 655 | 2,308
Estimated Fair Value | $ 4,277,864 | $ 3,892,385
% of Total | 10.20% | 9.70%
Other-than-temporary impairments in AOCI | $ 0 | $ 0
Residential mortgage-backed securities | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,969,694 | 1,872,236
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 34,746 | 22,267
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 10,254 | 25,282
Estimated Fair Value | $ 1,994,186 | $ 1,869,221
% of Total | 4.80% | 4.70%
Other-than-temporary impairments in AOCI | $ 0 | $ 0
Asset-backed Securities [Member] | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,243,449 | 2,171,254
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 14,286 | 10,779
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 15,749 | 32,829
Estimated Fair Value | $ 2,241,986 | $ 2,149,204
% of Total | 5.40% | 5.40%
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 | 1,404,852 | 1,428,115
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 30,009 | 9,153
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 3,115 | 18,234
Estimated Fair Value | $ 1,431,746 | $ 1,419,034
% of Total | 3.40% | 3.50%
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 | 1,578,975 | 2,233,537
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 9,826 | 10,204
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 21,238 | 57,867
Estimated Fair Value | $ 1,567,563 | $ 2,185,874
% of Total | 3.80% | 5.50%
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 | 738,690 | 721,290
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 56,668 | 39,914
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 2,641 | 9,010
Estimated Fair Value | $ 792,717 | $ 752,194
% of Total | 1.90% | 1.90%
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 | 4,166,073 | 3,680,863
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 201,446 | 109,320
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 12,476 | 47,868
Estimated Fair Value | $ 4,355,043 | $ 3,742,315
% of Total | 10.40% | 9.40%
Other-than-temporary impairments in AOCI | $ 0 | $ 0

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- Definition Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 9A -URI http://asc.fasb.org/extlink&oid=109979856&loc=SL6284427-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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