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Schedule II - Valuation and Qualifying Accounts (Consolidated) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Allowance for doubtful accounts and notes receivable [Member] |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at January 1 | $ 25 | $ 4 | $ 5
Charged to Expense | 5 | 23 | 2
Other | 0 | 0 | 0
Deductions | (17) | (2) | (3)
Balance at December 31 | 13 | 25 | 4
Deferred tax asset valuation allowance [Member] |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at January 1 | 3,040 | 1,254 | 675
Charged to Expense | 7,376 | 2,067 | 560
Other | (26) | (8) | 19
Deductions | (176) | (273) | 0
Balance at December 31 | 10,214 | 3,040 | 1,254
Restructuring accruals [Member] |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at January 1 | 48 | 53 | 80
Charged to Expense | (1) | 70 | 65
Other | 0 | (2) | 1
Deductions | (24) | (73) | (93)
Balance at December 31 | $ 23 | $ 48 | $ 53

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