Other Expenses (Other Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other Income and Expenses [Abstract]
Compensation	$ 78	$ 63	$ 150	$ 118
Commissions	191	174	383	368
Cost, Overhead	26	59	56	115
Interest Income (Expense), Net	(3)	(4)	(8)	4
Deferred Policy Acquisition Costs, Capitalization	(76)	(61)	(151)	(128)
Interest expense on debt	(3)	25	(2)	57
Premium taxes, licenses and fees	24	17	40	30
Professional services	60	46	93	81
Rent and related expenses	3	4	6	7
Other	147	137	277	244
Total other expenses	$ 447	$ 460	$ 844	$ 896