Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Allowance for doubtful accounts
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		$ 37	$ 40	$ 37
Charged to Costs and Expenses		27	22	39
Deductions		(12)	(24)	(39)
Other Activity		0	(1)	3
Balance at End of Period		52	37	40
Tax valuation allowance
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		766	832	1,075
Charged to Costs and Expenses	[1]	57	25	84
Deductions		(83)	(78)	(333)
Other Activity		16	(13)	6
Balance at End of Period		$ 756	$ 766	$ 832

[1] Additions Charged to Costs and Expenses and Deductions are primarily related to taxable losses for which the tax benefit has been reserved.