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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (DETAILS ) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowances for doubtful accounts      
Movement in Valuation Allowances and Reserves      
Balance at beginning of period $ 247 $ 283 $ 292
Charged to costs and expenses 64 71 73
Charged to other accounts (47) (23) (18)
Deductions from reserves (54) (84) (64)
Balance at end of period 210 247 283
Allowances for secured advances to suppliers      
Movement in Valuation Allowances and Reserves      
Balance at beginning of period 61 75 78
Charged to costs and expenses 11 9 34
Charged to other accounts (21) (7) (10)
Deductions from reserves (9) (16) (27)
Balance at end of period 42 61 75
Allowances for recoverable taxes      
Movement in Valuation Allowances and Reserves      
Balance at beginning of period 43 70 105
Charged to costs and expenses 7 7 19
Charged to other accounts (16) (14) (2)
Deductions from reserves (2) (20) (52)
Balance at end of period 32 43 70
Income tax valuation allowance      
Movement in Valuation Allowances and Reserves      
Balance at beginning of period 1,078 1,048 455
Charged to costs and expenses 44 76 642
Charged to other accounts (324) (46) (49)
Balance at end of period $ 798 $ 1,078 $ 1,048