Consolidated Statements Of Stockholders' Equity - USD ($) $ in Millions	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance as of beginning-of-year at Dec. 31, 2015	$ 10,677	$ 3,118	$ 1,091
Stock compensation/issued for benefit plans	19
Net income (loss)		1,173		$ 1,173
Dividends declared		(949)
Other comprehensive income (loss), net of tax			691	691
Balance as of end-of-period at Dec. 31, 2016	10,696	3,342	1,782	15,820
Stock compensation/issued for benefit plans	17
Net income (loss)		2,018		2,018
Dividends declared		(955)
Other comprehensive income (loss), net of tax			1,545	1,545
Balance as of end-of-period at Dec. 31, 2017	10,713	4,405	3,327	18,445
Cumulative effect from adoption of new accounting standards at Dec. 31, 2017		(644)	644
Capital contributions from Lincoln National Corporation	500
Stock compensation/issued for benefit plans	24
Net income (loss)		1,573		1,573
Dividends declared		(911)
Other comprehensive income (loss), net of tax			(3,312)	(3,312)
Balance as of end-of-period at Dec. 31, 2018	$ 11,237	$ 4,423	$ 659	$ 16,319