Other Expenses (Other Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Income and Expenses [Abstract]
Compensation	$ 95	$ 77	$ 245	$ 195
Commissions	199	189	582	557
Cost, Overhead	27	31	83	146
Interest Income (Expense), Net	(1)	(3)	(9)	1
Deferred Policy Acquisition Costs, Capitalization	(82)	(57)	(233)	(185)
Interest expense on debt	4	(1)	2	56
Premium taxes, licenses and fees	11	15	51	45
Professional services	119	53	212	134
Rent and related expenses	3	2	9	9
Other	134	140	411	384
Total other expenses	$ 509	$ 446	$ 1,353	$ 1,342