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Intangible assets
 12 Months Ended
Dec. 31, 2019
Intangible Assets [Abstract]  
Intangible assets
Intangible assets
 
 
 
 
 
 
 
$ million

 
 
 
 
2019

 
 
2018

 
 
Exploration and appraisal expenditurea

Other intangibles

Total

Exploration and appraisal expenditurea

Other intangibles

Total

Cost
 
 
 
 
 
 
 
At 1 January
 
17,053

4,504

21,557

17,886

4,488

22,374

Exchange adjustments
 
—

2

2

—

(128
)
(128
)
Acquisitions
 
—

35

35

—

25

25

Additions
 
1,268

457

1,725

1,095

318

1,413

Transfers to property, plant and equipment
 
(1,885
)
—

(1,885
)
(901
)
—

(901
)
Reclassified as assets held for sale
 
(671
)
—

(671
)
—

—

—

Deletions
 
(459
)
(98
)
(557
)
(1,027
)
(199
)
(1,226
)
At 31 December
 
15,306

4,900

20,206

17,053

4,504

21,557

Amortization
 
 
 
 
 
 
 
At 1 January
 
1,064

3,209

4,273

860

3,159

4,019

Exchange adjustments
 
—

4

4

—

(77
)
(77
)
Charge for the year
 
631

331

962

1,085

326

1,411

Impairment losses
 
2

2

4

137

—

137

Reclassified as assets held for sale
 
(61
)
—

(61
)
—

—

—

Deletions
 
(421
)
(94
)
(515
)
(1,018
)
(199
)
(1,217
)
At 31 December
 
1,215

3,452

4,667

1,064

3,209

4,273

Net book amount at 31 December
 
14,091

1,448

15,539

15,989

1,295

17,284

Net book amount at 1 January
 
15,989

1,295

17,284

17,026

1,329

18,355

a For further information see Intangible assets within Note 1 and Note 8.