Schedule II-Condensed Financial Information Of Registrant (Statements Of Income) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net investment income									$ 970	$ 867	$ 779
Net realized losses on financial instruments									(203)	200	220
Total other-than-temporary impairment losses on investments									(29)	(35)	(147)
Portion of other-than-temporary impairment losses recognized in other comprehensive income									3	2	32
Other-than-temporary impairment losses recognized in income									(26)	(33)	(115)
Other revenue									5,920	5,413	5,334
Total revenues (losses)	$ 23,373	$ 23,251	$ 22,944	$ 22,537	$ 22,682	$ 22,426	$ 22,407	$ 22,525	92,105	90,040	84,863
Interest expense									753	739	723
Loss on extinguishment of debt									11	282	0
Loss before income tax credits and equity in net income of subsidiaries									5,068	3,964	4,555
Net income	$ 424	$ 960	$ 1,054	$ 1,312	$ 1,232	$ 747	$ 855	$ 1,009	3,750	3,843	2,470
Parent Company [Member]
Net investment income									39	64	75
Net realized losses on financial instruments									(46)	(18)	(195)
Total other-than-temporary impairment losses on investments									(15)	(7)	(65)
Portion of other-than-temporary impairment losses recognized in other comprehensive income									0	0	17
Other-than-temporary impairment losses recognized in income									(15)	(7)	(48)
Other revenue									2	0	0
Total revenues (losses)									(20)	39	(168)
General and administrative expense									86	437	270
Interest expense									723	727	719
Loss on extinguishment of debt									11	283	0
Total expenses									820	1,447	989
Loss before income tax credits and equity in net income of subsidiaries									(840)	(1,408)	(1,157)
Income tax credits									(238)	(216)	(439)
Equity in net income of subsidiaries									4,352	5,035	3,188
Net income									$ 3,750	$ 3,843	$ 2,470