Other Revenues and Other Expenses (Other Expenses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Income and Expenses [Abstract]
Compensation	$ 304	$ 278	$ 263
Professional services	252	194	130
Transition Services Agreements	237	268	295
Establishment Costs	76	131	116
Premium and other taxes, licenses and fees	43	64	58
Custody Fees	3	2	3
Cost, Overhead	591	595	687
Interest expense on debt	60	6	56
Other General and Administrative Expense	243	225	225
Total other expenses	$ 1,809	$ 1,763	$ 1,833