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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Business, Basis of Presentation and Significant Accounting Policies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) segment Subsidiary	Jan. 01, 2019 USD ($)	Dec. 31, 2017 USD ($)
Item Effected [Line Items]
Revenue from contract with customer excluding assessed tax percentage	14.80%
number of non-insurance subsidiaries \| Subsidiary	1
Capitalized Contract Cost, Net	$ 93
Number of operating segments \| segment	1
Rate required of collateral as a percent of market value of loans securities	102.00%
Capitalized Contract Cost, Amortization	$ 18
Capitalized Contract Cost, Impairment Loss	0
Accounting Standards Update 2016-01
Item Effected [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption			$ 0
Accounting Standards Update 2016-01 \| Retained Earnings, Unappropriated
Item Effected [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption			(12)
Accounting Standards Update 2016-01 \| Retained Earnings (Deficit)
Item Effected [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption			(12)
Accounting Standards Update 2016-01 \| Accumulated Other Comprehensive Income (Loss)
Item Effected [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption			12
Accounting Standards Update 2014-09
Item Effected [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption			(72)
Accounts Receivable, Net	$ 63
Accounting Standards Update 2014-09 \| Retained Earnings (Deficit)
Item Effected [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption			(72)
Accounting Standards Update 2014-09 \| Accumulated Other Comprehensive Income (Loss)
Item Effected [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption			$ 0
Scenario, Forecast \| Accounting Standards Update 2018-02 \| Retained Earnings, Unappropriated
Item Effected [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 137
Scenario, Forecast \| Accounting Standards Update 2018-02 \| Accumulated Other Comprehensive Income (Loss)
Item Effected [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ (137)
Discontinued Operations, Held-for-sale \| Directed Services LLC (DSL)
Item Effected [Line Items]
Discontinued Operation, Equity Method Investment Retained after Disposal, Ownership Interest after Disposal	9.99%