Other Intangible Assets Level 4 - Other Intangible Assets Gross/Net (Details) $ in Millions	7 Months Ended	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-Lived Intangible Assets, Gross	$ 29	$ 29
Finite-Lived Intangible Assets, Accumulated Amortization	4	4
Finite-Lived Intangible Assets, Net [Abstract]	$ 25	$ 25
Finite-Lived Intangible Asset, Useful Life	5 years	5 years
Indefinite-lived Intangible Assets (Excluding Goodwill)	$ 26	$ 26
Intangible Assets, Gross (Excluding Goodwill)	55	55
Other Intangible Assets, Net	$ 51	$ 51