Other Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	$ (23)
Net Carrying Amount	$ 117
Finite-Lived Intangible Asset, Useful Life	4 years 8 months 26 days
Total, Gross Carrying Amount	$ 140
Total, Net Carrying Amount	117
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	77
Finite-Lived Intangible Assets, Accumulated Amortization	(14)
Net Carrying Amount	$ 63
Finite-Lived Intangible Asset, Useful Life	5 years 7 months 24 days
Technology
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 52
Finite-Lived Intangible Assets, Accumulated Amortization	(8)
Net Carrying Amount	$ 44
Finite-Lived Intangible Asset, Useful Life	3 years 6 months 25 days
Trade name
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 8
Finite-Lived Intangible Assets, Accumulated Amortization	(1)
Net Carrying Amount	$ 7
Finite-Lived Intangible Asset, Useful Life	4 years 7 months 24 days
Other
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 3
Finite-Lived Intangible Assets, Accumulated Amortization	0
Net Carrying Amount	$ 3
Finite-Lived Intangible Asset, Useful Life	4 years 9 months 24 days
Predecessor
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization		$ (14)
Finite-Lived Intangible Asset, Useful Life		4 years 9 months 24 days
Total, Gross Carrying Amount		$ 33
Total, Net Carrying Amount		19
Predecessor | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross		8
Finite-Lived Intangible Assets, Accumulated Amortization		(3)
Net Carrying Amount		$ 5
Finite-Lived Intangible Asset, Useful Life		6 years 7 months 24 days
Predecessor | Technology
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross		$ 12
Finite-Lived Intangible Assets, Accumulated Amortization		(6)
Net Carrying Amount		$ 6
Finite-Lived Intangible Asset, Useful Life		4 years 8 months 24 days
Predecessor | Trade name
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross		$ 12
Finite-Lived Intangible Assets, Accumulated Amortization		(5)
Net Carrying Amount		$ 7
Finite-Lived Intangible Asset, Useful Life		4 years
Predecessor | Licenses
Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets		$ 1