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Revenue from Contract with Customer Revenue from Contract with Customer (In-Text) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Receivables for revenue from contracts with customers		$ 400	$ 644
Financial Planning Fees [Member]
Disaggregation of Revenue [Line Items]
Contract liabilities		143	138
Capitalized contract cost, net		116	112
Transaction and other fees [Member]
Disaggregation of Revenue [Line Items]
Contract liabilities		$ 0	$ 0
Accounting Standards Update 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Impact of fees previously recorded as a reduction of expenses	$ 103