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Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Allowance for Doubtful Accounts and Other Customer Financing Activity [Member] |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount | $ 389 | $ 488 | $ 456 | $ 467
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense | 84 | 54 | 88 |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction | 113 | 37 | 82 |
Valuation Allowances and Reserves, Additions for Adjustments | (70) | 15 | (17) |
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount | 616 | 605 | 582 | $ 545
Valuation Allowances and Reserves Charged to Income Tax Expense | 117 | 61 | 45 |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Business Acquired | 2 | 25 |  |
Valuation Allowances and Reserves Credited to Income Tax Expense | 15 | 25 | 29 |
Valuation Allowances and Reserves, Additions for Adjustments | $ (93) | $ (38) | $ 21 |

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