SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (CONSOLIDATED) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Additions
Statutory U.S. Federal tax rate (as a percent)		35.00%
Change in valuation allowance: U.S. tax law change		$ 162
Expired foreign tax credits		327
Forecast
Additions
Statutory U.S. Federal tax rate (as a percent)	21.00%
Allowances for losses and discounts on receivables
Reserves deducted from assets in the balance sheets:
Balance at beginning of period	$ 34	32	$ 29	$ 34
Additions
Charged to costs and expenses/charged to income		12	15	12
Other		(2)	(2)	(5)
Deductions		(8)	(10)	(12)
Balance at end of period		34	32	29
Valuation allowance on net deferred tax assets
Reserves deducted from assets in the balance sheets:
Balance at beginning of period	$ 543	1,094	1,135	1,223
Additions
Charged to costs and expenses/charged to income		15	3	1
Other		(79)	(32)	5
Foreign currency translation		4	(3)	(20)
Other		(491)	(9)	(74)
Balance at end of period		$ 543	$ 1,094	$ 1,135