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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Available for sale securities, amortized cost	$ 48,238,946	$ 46,131,190
Available for sale securities, gross unrealized gains	3,633,599	1,143,624
Available for sale securities, gross unrealized losses	(292,055)	(1,351,087)
Available for sale securities, fair value	51,580,490	45,923,727
United States Government Full Faith and Credit
Debt Securities, Available-for-sale [Line Items]
Available for sale securities, amortized cost	161,492	11,872
Available for sale securities, gross unrealized gains	369	102
Available for sale securities, gross unrealized losses	(96)	(322)
Available for sale securities, fair value	161,765	11,652
United States Government Sponsored Agencies
Debt Securities, Available-for-sale [Line Items]
Available for sale securities, amortized cost	601,672	1,208,468
Available for sale securities, gross unrealized gains	28,133	13,095
Available for sale securities, gross unrealized losses	(4,785)	(83,034)
Available for sale securities, fair value	625,020	1,138,529
United States Municipalities, States and Territories
Debt Securities, Available-for-sale [Line Items]
Available for sale securities, amortized cost	4,147,343	3,880,703
Available for sale securities, gross unrealized gains	388,578	261,222
Available for sale securities, gross unrealized losses	(8,250)	(15,658)
Available for sale securities, fair value	4,527,671	4,126,267
Foreign Government Obligations
Debt Securities, Available-for-sale [Line Items]
Available for sale securities, amortized cost	186,993	226,860
Available for sale securities, gross unrealized gains	18,103	7,573
Available for sale securities, gross unrealized losses	0	(4,159)
Available for sale securities, fair value	205,096	230,274
Corporate Securities
Debt Securities, Available-for-sale [Line Items]
Available for sale securities, amortized cost	29,822,172	28,483,138
Available for sale securities, gross unrealized gains	2,796,926	727,105
Available for sale securities, gross unrealized losses	(82,259)	(838,729)
Available for sale securities, fair value	32,536,839	28,371,514
Residential Mortgage Backed Securities
Debt Securities, Available-for-sale [Line Items]
Available for sale securities, amortized cost	1,477,738	1,134,623
Available for sale securities, gross unrealized gains	101,617	71,661
Available for sale securities, gross unrealized losses	(3,691)	(4,125)
Available for sale securities, fair value	1,575,664	1,202,159
Commercial Mortgage Backed Securities
Debt Securities, Available-for-sale [Line Items]
Available for sale securities, amortized cost	5,591,167	5,492,271
Available for sale securities, gross unrealized gains	208,895	21,558
Available for sale securities, gross unrealized losses	(13,783)	(134,826)
Available for sale securities, fair value	5,786,279	5,379,003
Other Asset Backed Securities
Debt Securities, Available-for-sale [Line Items]
Available for sale securities, amortized cost	6,250,369	5,693,255
Available for sale securities, gross unrealized gains	90,978	41,308
Available for sale securities, gross unrealized losses	(179,191)	(270,234)
Available for sale securities, fair value	$ 6,162,156	$ 5,464,329

X

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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