SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for doubtful accounts, deducted from accounts receivable
Income tax valuation allowance, deducted from deferred tax assets
Balance at Beginning of Period	$ 67	$ 43	$ 32
Charged to Costs and Expenses	698	108	95
Charged to Other Accounts	112	0	0
Deductions	(194)	(84)	(84)
Balance at End of Period	683	67	43
Income tax valuation allowance, deducted from deferred tax assets
Income tax valuation allowance, deducted from deferred tax assets
Balance at Beginning of Period	266	242	3,794
Charged to Costs and Expenses	(29)	24	(3,543)
Charged to Other Accounts	11	0	(9)
Deductions	0	0	0
Balance at End of Period	$ 248	$ 266	$ 242