Revenue from Contract with Customer Revenue from Contract with Customer (In-Text) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Receivables for revenue from contracts with customers	$ 644	$ 657
Financial Planning Fees [Member]
Disaggregation of Revenue [Line Items]
Contract liabilities	138	134
Capitalized contract cost, net	112	109
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	$ 106	$ 103	$ 102

For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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