Other Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 145	$ 140
Accumulated Amortization	(71)	(23)
Net Carrying Amount	$ 74	$ 117
Weighted Average Remaining Life in Years	4 years 8 months 12 days	4 years 8 months 26 days
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 90	$ 77
Accumulated Amortization	(45)	(14)
Net Carrying Amount	$ 45	$ 63
Weighted Average Remaining Life in Years	5 years 10 months 25 days	5 years 7 months 24 days
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 46	$ 52
Accumulated Amortization	(23)	(8)
Net Carrying Amount	$ 23	$ 44
Weighted Average Remaining Life in Years	2 years 10 months 25 days	3 years 6 months 25 days
Trade name
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 8	$ 8
Accumulated Amortization	(2)	(1)
Net Carrying Amount	$ 6	$ 7
Weighted Average Remaining Life in Years	3 years 6 months 25 days	4 years 7 months 24 days
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1	$ 3
Accumulated Amortization	(1)	0
Net Carrying Amount	$ 0	$ 3
Weighted Average Remaining Life in Years	2 years 9 months 18 days	4 years 9 months 18 days