SEC Schedule, Article 12-09, Valuation and Qualifying Accounts (Details) - SEC Schedule, 12-09, Allowance, Credit Loss - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	$ 1,570	$ 2,120	$ 2,060	$ 2,790
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense	830	2,080	810
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account	190	100	490
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	$ 1,570	$ 2,120	$ 2,030