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Capital and Financial Risk Management - Summary of Maturity Analysis for Derivative Financial Instruments (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Financial liabilities - cash outflows    
Trade and other payables $ 6,597 $ 5,778
Lease liabilities 2,188 2,176
Other interest-bearing loans and borrowings 10,435 12,088
Interest payments on other interest-bearing loans and borrowings [1] 3,032 3,439
Currency forwards and currency swaps - gross cash outflows 1,567 2,345
Other derivative financial instruments 1 6
Gross projected cash outflows 23,820 25,832
Derivative financial instruments - cash inflows    
Interest rate swaps - net cash inflows [2] (162) (197)
Currency forwards and currency swaps - gross cash inflows (1,559) (2,350)
Other derivative financial instruments (33) (5)
Gross projected cash inflows (1,754) (2,552)
Within 1 year [member]    
Financial liabilities - cash outflows    
Trade and other payables 5,697 4,797
Lease liabilities 302 301
Other interest-bearing loans and borrowings 559 1,270
Interest payments on other interest-bearing loans and borrowings [1] 315 345
Currency forwards and currency swaps - gross cash outflows 1,567 2,345
Other derivative financial instruments 1 5
Gross projected cash outflows 8,441 9,063
Derivative financial instruments - cash inflows    
Interest rate swaps - net cash inflows [2] (41) (40)
Currency forwards and currency swaps - gross cash inflows (1,559) (2,350)
Other derivative financial instruments (32) (4)
Gross projected cash inflows (1,632) (2,394)
Between1 and 2 years [member]    
Financial liabilities - cash outflows    
Trade and other payables 196 171
Lease liabilities 254 255
Other interest-bearing loans and borrowings 1,420 479
Interest payments on other interest-bearing loans and borrowings [1] 286 328
Other derivative financial instruments 1
Gross projected cash outflows 2,156 1,234
Derivative financial instruments - cash inflows    
Interest rate swaps - net cash inflows [2] (34) (40)
Other derivative financial instruments (1) (1)
Gross projected cash inflows (35) (41)
Between 2 and 3 years [member]    
Financial liabilities - cash outflows    
Trade and other payables 44 49
Lease liabilities 208 208
Other interest-bearing loans and borrowings 683 1,538
Interest payments on other interest-bearing loans and borrowings [1] 264 296
Other derivative financial instruments  
Gross projected cash outflows 1,199 2,091
Derivative financial instruments - cash inflows    
Interest rate swaps - net cash inflows [2] (32) (33)
Other derivative financial instruments  
Gross projected cash inflows (32) (33)
Between 3 and 4 years [member]    
Financial liabilities - cash outflows    
Trade and other payables 202 209
Lease liabilities 175 177
Other interest-bearing loans and borrowings 1,254 741
Interest payments on other interest-bearing loans and borrowings [1] 238 272
Other derivative financial instruments  
Gross projected cash outflows 1,869 1,399
Derivative financial instruments - cash inflows    
Interest rate swaps - net cash inflows [2] (22) (30)
Other derivative financial instruments  
Gross projected cash inflows (22) (30)
Between 4 and 5 years [member]    
Financial liabilities - cash outflows    
Trade and other payables 170 181
Lease liabilities 150 150
Other interest-bearing loans and borrowings 853 1,255
Interest payments on other interest-bearing loans and borrowings [1] 214 246
Other derivative financial instruments  
Gross projected cash outflows 1,387 1,832
Derivative financial instruments - cash inflows    
Interest rate swaps - net cash inflows [2] (13) (22)
Other derivative financial instruments  
Gross projected cash inflows (13) (22)
After 5 years [member]    
Financial liabilities - cash outflows    
Trade and other payables 288 371
Lease liabilities 1,099 1,085
Other interest-bearing loans and borrowings 5,666 6,805
Interest payments on other interest-bearing loans and borrowings [1] 1,715 1,952
Gross projected cash outflows 8,768 10,213
Derivative financial instruments - cash inflows    
Interest rate swaps - net cash inflows [2] (20) (32)
Gross projected cash inflows $ (20) $ (32)
[1] At 31 December 2021 and 31 December 2020, a portion of the Group’s long-term debt carried variable interest rates. The Group uses the interest rates in effect on 31 December to calculate the interest payments on the long-term debt for the periods indicated.
[2] The Group uses interest rate swaps to help manage its interest cost. Under these contracts the Group has agreed to exchange at predetermined intervals, the net difference between fixed and variable interest amounts calculated by reference to a pre-agreed notional principal. The Group uses the interest rates in effect on 31 December to calculate the net interest receipts or payments on these contracts.