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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
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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

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