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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount | $ 88 | $ 64 | $ 59 | $ 56
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense | 39 | 20 | 15 |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction | 13 | 14 | 14 |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment | $ 2 | $ 1 | $ (2) |

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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