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Risks Arising from Financial Instruments - Summary of Nominal Contractual Maturities of Non-Derivative Financial Liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Dec. 16, 2016
Non-derivative financial liabilities      
Unsecured bond issues     $ (300)
Bank overdraft $ (153) $ (68)  
Net carrying amount [member]      
Non-derivative financial liabilities      
Secured bank loans (1,043) (861)  
Commercial papers (3,072) (1,599)  
Unsecured bank loans (188) (185)  
Unsecured bond issues (106,078) (98,206)  
Unsecured other loans (97) (98)  
Finance lease liabilities (2,040) (2,025)  
Bank overdraft (153) (68)  
Trade and other payables (20,476) (24,806)  
Non-derivative financial liabilities (133,147) (127,848)  
Derivative financial assets/(liabilities)      
Interest rate derivatives   (102)  
Foreign exchange derivatives (95) (600)  
Cross currency interest rate swaps (116) (175)  
Commodity derivatives (250) (97)  
Equity derivatives (6,404) (3,177)  
Derivative financial assets/(liabilities) (6,864) (4,151)  
Of which: related to cash flow hedges (498) (448)  
Contractual cash flows [member]      
Non-derivative financial liabilities      
Secured bank loans (1,080) (890)  
Commercial papers (3,072) (1,599)  
Unsecured bank loans (196) (188)  
Unsecured bond issues (180,259) (165,424)  
Unsecured other loans (129) (131)  
Finance lease liabilities (2,304) (2,338)  
Bank overdraft (153) (68)  
Trade and other payables (20,697) (25,152)  
Non-derivative financial liabilities (207,890) (195,790)  
Derivative financial assets/(liabilities)      
Interest rate derivatives   (103)  
Foreign exchange derivatives (95) (600)  
Cross currency interest rate swaps (182) (187)  
Commodity derivatives (250) (97)  
Equity derivatives (6,440) (3,177)  
Derivative financial assets/(liabilities) (6,967) (4,164)  
Of which: related to cash flow hedges (498) (448)  
Contractual cash flows [member] | Less than 1 year [member]      
Non-derivative financial liabilities      
Secured bank loans (1,017) (795)  
Commercial papers (3,072) (1,599)  
Unsecured bank loans (138) (140)  
Unsecured bond issues (5,647) (5,513)  
Unsecured other loans (21) (27)  
Finance lease liabilities (419) (404)  
Bank overdraft (153) (68)  
Trade and other payables (18,845) (22,861)  
Non-derivative financial liabilities (29,312) (31,407)  
Derivative financial assets/(liabilities)      
Interest rate derivatives   (7)  
Foreign exchange derivatives (95) (600)  
Cross currency interest rate swaps   75  
Commodity derivatives (250) (97)  
Equity derivatives (4,372) (3,177)  
Derivative financial assets/(liabilities) (4,717) (3,806)  
Of which: related to cash flow hedges (424) (408)  
Contractual cash flows [member] | 1-2 years [member]      
Non-derivative financial liabilities      
Secured bank loans (16) (18)  
Unsecured bank loans (58) (47)  
Unsecured bond issues (7,201) (6,415)  
Unsecured other loans (14) (17)  
Finance lease liabilities (393) (350)  
Trade and other payables (1,182) (1,227)  
Non-derivative financial liabilities (8,864) (8,074)  
Derivative financial assets/(liabilities)      
Interest rate derivatives   (1)  
Cross currency interest rate swaps (108) (285)  
Equity derivatives (2,068)    
Derivative financial assets/(liabilities) (2,176) (286)  
Of which: related to cash flow hedges   5  
Contractual cash flows [member] | 2-3 years [member]      
Non-derivative financial liabilities      
Secured bank loans (12) (18)  
Unsecured bank loans 0 (1)  
Unsecured bond issues (10,042) (6,518)  
Unsecured other loans (8) (9)  
Finance lease liabilities (278) (243)  
Trade and other payables (178) (472)  
Non-derivative financial liabilities (10,518) (7,261)  
Derivative financial assets/(liabilities)      
Interest rate derivatives   (1)  
Cross currency interest rate swaps   6  
Derivative financial assets/(liabilities)   5  
Of which: related to cash flow hedges   3  
Contractual cash flows [member] | 3-5 years [member]      
Non-derivative financial liabilities      
Secured bank loans (12) (22)  
Unsecured bond issues (20,065) (18,605)  
Unsecured other loans (5) (5)  
Finance lease liabilities (401) (285)  
Trade and other payables (183) (165)  
Non-derivative financial liabilities (20,666) (19,082)  
Derivative financial assets/(liabilities)      
Interest rate derivatives   3  
Cross currency interest rate swaps   75  
Derivative financial assets/(liabilities)   78  
Of which: related to cash flow hedges   5  
Contractual cash flows [member] | Greater than 5 years [member]      
Non-derivative financial liabilities      
Secured bank loans (23) (37)  
Unsecured bond issues (137,304) (128,373)  
Unsecured other loans (81) (73)  
Finance lease liabilities (813) (1,056)  
Trade and other payables (309) (427)  
Non-derivative financial liabilities (138,530) (129,966)  
Derivative financial assets/(liabilities)      
Interest rate derivatives   (97)  
Cross currency interest rate swaps (74) (58)  
Derivative financial assets/(liabilities) (74) (155)  
Of which: related to cash flow hedges $ (74) $ (53)