Other Intangible Assets Level 4 - Other Intangible Assets Gross/Net $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-Lived Intangible Assets, Gross	$ 29
Finite-Lived Intangible Assets, Accumulated Amortization	1
Finite-Lived Intangible Assets, Net	$ 28
Finite-Lived Intangible Asset, Useful Life	5 years
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 26
Intangible Assets, Gross (Excluding Goodwill)	55
Amortization of Intangible Assets	1
Other Intangible Assets, Net	$ 54