CONSOLIDATED CONDENSED STATEMENTS OF SHAREOWNER'S EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect Adjustment	Preferred Stock	Common Stock	Additional Paid-In-Capital	Retained Earnings	Retained Earnings Cumulative Effect Adjustment	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2018	$ 7,042,788	$ (50,804)	$ 2	$ 5,000	$ 7,410,537	$ 1,031,465	$ (50,804)	$ (1,404,216)
Increase (decrease) in shareowner's equity
Net income	486,936					486,936
Other comprehensive income	2,962,999							2,962,999
Comprehensive income	3,449,935
Capital contributions from parent	850,000				850,000
Ending Balance at Sep. 30, 2019	11,291,919		2	5,000	8,260,537	1,467,597		1,558,783
Beginning Balance at Jun. 30, 2019	10,277,047		2	5,000	8,260,537	1,277,173		734,335
Increase (decrease) in shareowner's equity
Net income	190,424					190,424
Other comprehensive income	824,448							824,448
Comprehensive income	1,014,872
Ending Balance at Sep. 30, 2019	11,291,919		2	5,000	8,260,537	1,467,597		1,558,783
Beginning Balance at Dec. 31, 2019	11,206,826	$ (138,100)	2	5,000	8,260,537	1,533,645	$ (138,100)	1,407,642
Increase (decrease) in shareowner's equity
Net income	298,832					298,832
Other comprehensive income	1,346,383							1,346,383
Comprehensive income	1,645,215
Ending Balance at Sep. 30, 2020	12,713,941		2	5,000	8,260,537	1,694,377		2,754,025
Beginning Balance at Jun. 30, 2020	12,116,623		2	5,000	8,260,537	1,634,615		2,216,469
Increase (decrease) in shareowner's equity
Net income	59,762					59,762
Other comprehensive income	537,556							537,556
Comprehensive income	597,318
Ending Balance at Sep. 30, 2020	$ 12,713,941		$ 2	$ 5,000	$ 8,260,537	$ 1,694,377		$ 2,754,025