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Provisions (Tables)
 12 Months Ended
Dec. 31, 2017
Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]  
Summary of movements in each class of provisions
Movements during the year in the remaining provision, which relates to litigation and claims, are presented in the table below.
 
 
$ million

 
 
2017

 
 
Litigation and claims

At 1 January
 
2,442

Increase in provision
 
2,647

Reclassified to other payables
 
(759
)
Utilization
 
(1,750
)
At 31 December
 
2,580

Of which – current
 
1,439

 – non-current
 
1,141

 
 
 
 
 
 
$ million

 
 
Decommissioning

Environmental

Litigation and claims

Other

Total

At 1 January 2017
 
16,442

1,584

3,162

3,236

24,424

Exchange adjustments
 
326

12

4

162

504

Acquisitions
 
—

2

—

—

2

Increase (decrease) in existing provisions
 
(228
)
249

2,907

786

3,714

Write-back of unused provisions
 
—

(94
)
(26
)
(369
)
(489
)
Unwinding of discount
 
121

8

8

13

150

Change in discount rate
 
(106
)
—

(13
)
(14
)
(133
)
Utilization
 
(21
)
(231
)
(1,916
)
(739
)
(2,907
)
Reclassified to other payables
 
(239
)
—

(792
)
(73
)
(1,104
)
Deletions
 
(195
)
(14
)
—

(8
)
(217
)
At 31 December 2017
 
16,100

1,516

3,334

2,994

23,944

Of which – current
 
378

269

1,738

939

3,324

– non-current
 
15,722

1,247

1,596

2,055

20,620

Of which – Gulf of Mexico oil spilla
 
—

—

2,580

—

2,580

a 
Further information on the financial impacts of the Gulf of Mexico oil spill is provided in Note 2.