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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Revenue from Contracts with Customers (In-Text) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Receivables for revenue from contracts with customers	$ 670		$ 670		$ 657
Financial planning fees [Member]
Disaggregation of Revenue [Line Items]
Contract liabilities	128		128		134
Capitalized contract costs	105		105		109
Transaction and other fees [Member]
Disaggregation of Revenue [Line Items]
Contract liabilities	16		16		$ 0
Revenue from contracts with customers standard [Member]
Disaggregation of Revenue [Line Items]
Impact of fees previously recorded as a reduction of expenses	$ 26	$ 24	$ 79	$ 75