Statutory Net Income and Surplus and Dividend Restrictions (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Insurance [Abstract]
Statutory net income (loss)	$ 192	$ (503)	$ 578
Statutory surplus	1,461	1,365
Statutory surplus capacity to pay divided without prior approval in 2019	146
Statutory dividend paid to Prudential Insurance	$ 0	$ 250	$ 2,593