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Schedule II Valuation and Qualifying Accounts (Details) - SEC Schedule, 12-09, Allowance, Notes Receivable [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 88 $ 64 $ 59
Charged to Costs & Expenses 65 39 20
Uncollectible Amounts Written Off, Net of Recoveries 22 13 14
Effect of Changes in Foreign Currency Exchange Rates 0 2 1
Balance at End of Period $ 131 $ 88 $ 64