CONSOLIDATED STATEMENTS OF SHAREOWNER'S EQUITY - USD ($) $ in Thousands	Total	Cumulative effect adjustments	Preferred Stock	Common Stock	Additional Paid-In- Capital	Retained Earnings	Retained Earnings Cumulative effect adjustments	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative effect adjustments
Beginning balance at Dec. 31, 2017	$ 8,324,285	$ (89,985)	$ 2	$ 5,000	$ 7,378,496	$ 916,971	$ (79,433)	$ 23,816	$ (10,552)
Increase (decrease) in shareowner's equity
Net income	193,927					193,927
Other comprehensive income (loss)	(1,417,480)							(1,417,480)
Comprehensive income (loss)	(1,223,553)
Prior period adjustment	32,041				32,041
Ending 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	552,984					552,984
Other comprehensive income (loss)	2,811,858							2,811,858
Comprehensive income (loss)	3,364,842
Capital contributions from parent	850,000				850,000
Ending 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	342,362					342,362
Other comprehensive income (loss)	2,128,375							2,128,375
Comprehensive income (loss)	2,470,737
Ending balance at Dec. 31, 2020	$ 13,539,463		$ 2	$ 5,000	$ 8,260,537	$ 1,737,907		$ 3,536,017