Business, Basis of Presentation and Significant Accounting Policies Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018
Disaggregation of Revenue [Line Items]
Capitalized Contract Cost, Impairment Loss	$ 0
Capitalized Contract Cost, Amortization	23	$ 22
Capitalized Contract Cost, Net	$ 109	$ 105
Revenue from contract with customer excluding assessed tax percentage	19.70%	22.90%
Other assets	$ 255	$ 331
Retained earnings (deficit)	275	508
Operating expenses	1,056	894	$ 1,022
Net Cash Provided by (Used in) Operating Activities	1,363	1,223	$ 964
Recordkeeping & administration
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	405	422
Distribution & shareholder servicing
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	82	123
Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Accounts Receivable, after Allowance for Credit Loss	$ 97	95
Cumulative Effect of New Accounting Principle in Period of Adoption				$ 76
Maximum
Disaggregation of Revenue [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years
Minimum
Disaggregation of Revenue [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Other assets		105		95
Deferred Income Tax Liabilities, Net		(22)		(19)
Retained earnings (deficit)		83
Operating expenses		3
Net Cash Provided by (Used in) Operating Activities		$ 0
Retained Earnings (Deficit) | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ 76