Recently Adopted and Issued Accounting Guidance Recently Adopted and Issued Accounting Guidance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Liability	$ 3
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net	5
Operating Lease, Right-of-Use Asset	$ 3
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Liability		$ 3
Operating Lease, Right-of-Use Asset		$ 3