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Net Finance Costs - Summary of Net Finance Costs (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Interest expense using the effective interest rate method:      
Interest on bank loans, overdrafts and all other borrowings $ 660 $ 558 $ 1,168
Interest capitalised at 4.94% (31 December 2017: 3.86%; 30 June 2018: 4.24%) (109) (59) (139)
Interest on finance leases 23 29 59
Discounting on provisions and other liabilities 223 211 414
Other gains and losses      
Fair value change on hedged loans 106 93 (265)
Fair value change on hedging derivatives (148) (26) 329
Exchange variations on net debt 11 (75) (19)
Other 6 6 20
Total Financial expenses 772 737 1,567
Financial income      
Interest income (239) (79) (322)
Net finance costs $ 533 $ 658 $ 1,245