Income Taxes (Details 5) $ in Millions	7 Months Ended	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Income Tax Contingency [Line Items]
Increase in Unrecognized Tax Benefits is Reasonably Possible	$ 70	$ 70
Unrecognized Tax Benefits, Increase Resulting from Acquisition	160
Unrecognized Tax Benefits, Increase Resulting from 2017 Tax Act		100
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	24	24
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	430	430
Tax Credit Carryforward, Amount	255	255
Operating Loss Carryforwards	330	330
Tax Credit Carryforward, Valuation Allowance	110	110
Operating Loss Carryforwards, Valuation Allowance	$ 27	$ 27