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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
Additions      
Statutory U.S. Federal tax rate (as a percent) 21.00% 21.00% 35.00%
Change in valuation allowance: U.S. tax law change   $ 2 $ 162
Expired foreign tax credits     327
Allowances for losses and discounts on receivables      
Reserves deducted from assets in the balance sheets:      
Balance at beginning of period $ 35 34 32
Additions      
Charged to costs and expenses/charged to income 15 13 12
Other (2) (4) (2)
Deductions (16) (8) (8)
Balance at end of period 32 35 34
Valuation allowance on net deferred tax assets      
Reserves deducted from assets in the balance sheets:      
Balance at beginning of period 495 543 1,094
Additions      
Charged to costs and expenses/charged to income (31) (20) 15
Other (14) (7) (79)
Foreign currency translation (1) (9) 4
Other 13 (12) (491)
Balance at end of period $ 462 $ 495 $ 543