Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Effective tax rate from continuing operations	31.70%	(38.70%)	24.30%	(1.60%)
Unrecognized Tax Benefits	$ 279		$ 279		$ 455
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	185		185		$ 355
Decrease in Unrecognized Tax Benefits is Reasonably Possible	23		23
The CARES Act	2,200,000		2,200,000
Tax Adjustments, Settlements, and Unusual Provisions	91
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority	$ 62		$ 62