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FINANCIAL ASSETS AND LIABILITIES - Bank loans and bonds (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Bank loans and bonds    
Total bank loans and bonds $ 11,103 $ 10,489
Loan 8.75-10.0%    
Bank loans and bonds    
Total bank loans and bonds 2,474  
Notes 5.2-5.95%    
Bank loans and bonds    
Total bank loans and bonds 1,554 $ 1,554
Notes 3.95-4.95%    
Bank loans and bonds    
Total bank loans and bonds 1,500  
Loan 1.9-2.75%    
Bank loans and bonds    
Total bank loans and bonds $ 752  
Notes 7.5%    
Bank loans and bonds    
Interest rate (as a percent) 7.50% 7.50%
Total bank loans and bonds $ 628 $ 1,280
Syndicated loan    
Bank loans and bonds    
Total bank loans and bonds $ 250  
Notes 9%    
Bank loans and bonds    
Interest rate (as a percent) 9.00% 9.00%
Total bank loans and bonds $ 208 $ 198
Notes 6.25%    
Bank loans and bonds    
Spread on interest rate basis (as a percent) 6.25% 6.25%
Total bank loans and bonds   $ 349
Notes 6.25-7.25%    
Bank loans and bonds    
Total bank loans and bonds $ 1,200 1,200
Eurobonds    
Bank loans and bonds    
Total bank loans and bonds 543 1,150
Loan 0.35-0.8%    
Bank loans and bonds    
Total bank loans and bonds 379 166
Loan 1.9%    
Bank loans and bonds    
Total bank loans and bonds $ 212 $ 231
Loan 12.75%    
Bank loans and bonds    
Interest rate (as a percent) 12.75% 12.75%
Total bank loans and bonds   $ 1,021
Loan 3.3%    
Bank loans and bonds    
Total bank loans and bonds   $ 1,000
Senior Notes    
Bank loans and bonds    
Interest rate (as a percent) 8.60% 8.60%
Total bank loans and bonds $ 300 $ 300
Syndicated loan (Algeria)    
Bank loans and bonds    
Total bank loans and bonds   340
Ruble Bonds    
Bank loans and bonds    
Total bank loans and bonds 19 660
Other loans    
Bank loans and bonds    
Total bank loans and bonds $ 1,084 $ 1,040
Minimum | Loan 8.75-10.0%    
Bank loans and bonds    
Interest rate (as a percent) 8.75% 8.75%
Minimum | Notes 5.2-5.95%    
Bank loans and bonds    
Interest rate (as a percent) 5.20% 5.20%
Minimum | Notes 3.95-4.95%    
Bank loans and bonds    
Interest rate (as a percent) 3.95%  
Minimum | Notes 6.25-7.25%    
Bank loans and bonds    
Interest rate (as a percent) 6.25% 6.25%
Minimum | Eurobonds    
Bank loans and bonds    
Interest rate (as a percent) 7.748% 7.748%
Minimum | Ruble Bonds    
Bank loans and bonds    
Interest rate (as a percent) 10.00% 10.00%
Maximum | Loan 8.75-10.0%    
Bank loans and bonds    
Interest rate (as a percent) 10.00% 10.00%
Maximum | Notes 5.2-5.95%    
Bank loans and bonds    
Interest rate (as a percent) 5.95% 5.95%
Maximum | Notes 3.95-4.95%    
Bank loans and bonds    
Interest rate (as a percent) 4.95%  
Maximum | Loan 1.9-2.75%    
Bank loans and bonds    
Interest rate (as a percent) 2.75%  
Maximum | Notes 6.25-7.25%    
Bank loans and bonds    
Interest rate (as a percent) 7.25% 7.25%
Maximum | Eurobonds    
Bank loans and bonds    
Interest rate (as a percent) 9.10% 9.10%
Maximum | Loan 0.35-0.8%    
Bank loans and bonds    
Interest rate (as a percent) 0.80%  
Maximum | Ruble Bonds    
Bank loans and bonds    
Interest rate (as a percent) 11.90% 11.90%
1m LIBOR | Syndicated loan    
Bank loans and bonds    
Spread on interest rate basis (as a percent) 2.25%  
1m LIBOR | Loan 3.3%    
Bank loans and bonds    
Interest rate (as a percent) 3.30% 3.30%
6m LIBOR | Loan 1.9%    
Bank loans and bonds    
Spread on interest rate basis (as a percent) 1.90%  
3m EURIBOR | Minimum | Loan 1.9-2.75%    
Bank loans and bonds    
Spread on interest rate basis (as a percent) 1.90%  
6m KIBOR | Minimum | Loan 0.35-0.8%    
Bank loans and bonds    
Spread on interest rate basis (as a percent) 0.35%  
Bank of Algeria re-discount rate | Maximum | Syndicated loan (Algeria)    
Bank loans and bonds    
Spread on interest rate basis (as a percent) 2.00% 2.00%