Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Contingency [Line Items]
Income tax expense (benefit)	$ (34)	$ 15	$ (33)	$ 24
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	48		48
Minimum
Income Tax Contingency [Line Items]
Reasonable possible decrease in unrecognized tax benefits	30		30
Maximum
Income Tax Contingency [Line Items]
Reasonable possible decrease in unrecognized tax benefits	$ 37		37
Out of period adjustments - stock compensation permanent differences [Member]
Income Tax Contingency [Line Items]
Income tax expense (benefit)			2
Out of period adjustments - write-off of income tax payables [Member]
Income Tax Contingency [Line Items]
Income tax expense (benefit)			$ 3