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Impairment charges - (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure of impairment loss recognised or reversed for cash-generating unit [abstract]  
Summary of impairment charges

Note

Pre-tax
amount
2019
US$m

Taxation
2019
US$m

Non-controlling
interest
2019
US$m

Net
amount
2019
US$m

Pre-tax
amount
2018
US$m

Pre-tax
amount
2017
US$m

Copper & Diamonds – Oyu Tolgoi
 
(2,240
)
(39
)
1,506

(773
)
—

—

Aluminium – Yarwun alumina refinery
 
(1,138
)
339

—

(799
)
—

—

Aluminium – ISAL Smelter
 
(109
)
23

—

(86
)
(123
)
—

Energy & Minerals – Rössing
 
—

—

—

—

(9
)
(267
)
Energy & Minerals – Roughrider
 
—

—

—

—

—

(357
)
Copper & Diamonds – Argyle
 
—

—

—

—

—

(172
)
Total impairment charge
 
(3,487
)
323

1,506

(1,658
)
(132
)
(796
)

 
 
 
 
 
 
 
Allocated as:
 
 
 
 
 
 
 
Intangible assets
13

(1
)
 
 
 
(2
)
(357
)
Property, plant and equipment
14

(3,486
)
 
 
 
(130
)
(435
)
Other assets and liabilities
 
—

 
 
 
—

(4
)
Total impairment charge
 
(3,487
)
 
 
 
(132
)
(796
)
Comprising:
 
 
 
 
 
 
 
Total impairment charges in the financial information by business unit (page 252)
 
 
 
 
(3,487
)
(132
)
(796
)
Taxation (including related to EAUs)
 
 
 
 
323

25

141

Non-controlling interests
 
 
 
 
1,506

3

174

Total impairment in the income statement
 
 
 
 
(1,658
)
(104
)
(481
)