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Business, Basis of Presentation and Significant Accounting Policies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)	Jan. 01, 2018 USD ($)
Item Effected [Line Items]
Impact to previously reported net income		$ 50	$ 95
Revenue from contract with customer excluding assessed tax percentage	19.70%	22.90%
Number of operating segments \| segment	1
Rate required of collateral as a percent of market value of loans securities	102.00%
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					76
Accounts Receivable, after Allowance for Credit Loss	$ 97	$ 95
Accounting Standards Update 2014-09 \| Retained Earnings (Deficit)
Item Effected [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption					76
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
Adjustment for adoption of ASU 2018-02
Item Effected [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	0
Adjustment for adoption of ASU 2018-02 \| Retained Earnings, Unappropriated
Item Effected [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ (137)
Adjustment for adoption of ASU 2018-02 \| Retained Earnings (Deficit)
Item Effected [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	(137)
Adjustment for adoption of ASU 2018-02 \| Accumulated Other Comprehensive Income (Loss)
Item Effected [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 137			$ 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%