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Risks Arising from Financial Instruments - Summary for Each Type of Derivative Fair Value Recognized as Assets and Liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]    
Assets $ 842 $ 362
Liabilities (6,864) (4,151)
Net (6,022) (3,789)
Non-current, Assets 297 132
Non-current, Liabilities (2,460) (352)
Non-current, Net (2,163) (220)
Derivatives 545 230
Derivatives (4,403) (3,799)
Current derivative financial assets liabilities, net, Total (3,859) (3,569)
Forward exchange contracts [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets 437 112
Liabilities (93) (590)
Net 344 (478)
Foreign currency futures [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets 1 7
Liabilities (2) (9)
Net (1) (2)
Interest rate swap [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets 101 18
Liabilities   (6)
Net 101 12
Cross currency interest rate swap [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets 275 157
Liabilities (115) (175)
Net 160 (18)
Other interest rate derivatives [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities   (97)
Net   (97)
Aluminum swaps [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets 7 15
Liabilities (169) (61)
Net (162) (46)
Sugar futures commodity contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets 1 2
Liabilities (3) (2)
Net (2)  
Wheat futures commodity contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets 1 14
Liabilities (1) (9)
Net   5
Other commodity contracts [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets 10 13
Liabilities (37) (14)
Net (27) (1)
Equity derivatives [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets 5 17
Liabilities (6,404) (3,177)
Net (6,399) (3,160)
Energy futures commodity contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets 5 8
Liabilities (40) (11)
Net $ (35) $ (3)