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Investments (Investments in Fixed Maturity Securities Available-for-Sale by Sector) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 44,860,441 | $ 38,882,168
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 4,723,069 | 1,858,668
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 102,243 | 748,490
Estimated Fair Value | $ 49,481,267 | $ 39,992,346
% of Total | 100.00% | 100.00%
Other-than-temporary impairments in AOCI | $ 275 | $ 275
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 28,154,301 | 24,006,407
Estimated Fair Value | $ 30,353,219 | $ 23,982,119
% of Total | 100.00% | 100.00%
Corporate Debt Securities [Member] | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 28,154,301 | $ 24,006,407
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2,277,070 | 530,804
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 78,152 | 555,092
Estimated Fair Value | $ 30,353,219 | $ 23,982,119
% of Total | 61.30% | 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 | 2,962,729 | 2,768,466
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,670,680 | 1,126,227
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 190 | 2,308
Estimated Fair Value | $ 4,633,219 | $ 3,892,385
% of Total | 9.40% | 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 | 2,360,691 | 1,872,236
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 81,367 | 22,267
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 2,216 | 25,282
Estimated Fair Value | $ 2,439,842 | $ 1,869,221
% of Total | 4.90% | 4.70%
Other-than-temporary impairments in AOCI | $ 0 | $ 0
Asset-backed securities | Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,809,008 | 2,171,254
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 27,621 | 10,779
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 13,994 | 32,829
Estimated Fair Value | $ 2,822,635 | $ 2,149,204
% of Total | 5.70% | 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 | 1,698,334 | 1,428,115
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 84,345 | 9,153
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 461 | 18,234
Estimated Fair Value | $ 1,782,218 | $ 1,419,034
% of Total | 3.60% | 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 | 1,570,540 | 2,233,537
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 98,193 | 10,204
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 228 | 57,867
Estimated Fair Value | $ 1,668,505 | $ 2,185,874
% of Total | 3.40% | 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 | 1,078,019 | 721,290
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 113,684 | 39,914
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1,600 | 9,010
Estimated Fair Value | $ 1,190,103 | $ 752,194
% of Total | 2.40% | 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 | 4,226,819 | 3,680,863
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 370,109 | 109,320
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 5,402 | 47,868
Estimated Fair Value | $ 4,591,526 | $ 3,742,315
% of Total | 9.30% | 9.40%
Other-than-temporary impairments in AOCI | $ 0 | $ 0

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