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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