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Provisions (Tables)
 12 Months Ended
Dec. 31, 2018
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

 
 
2018

 
 
Litigation and claims

At 1 January
 
2,580

Increase in provision
 
629

Reclassified to other payables
 
(2,045
)
Utilization
 
(819
)
At 31 December
 
345

Of which – current
 
333

 – non-current
 
12


 
 
 
 
 
 
$ million

 
 
Decommissioning

Environmental

Litigation and claims

Other

Total

At 1 January 2018
 
16,100

1,516

3,334

2,994

23,944

Exchange adjustments
 
(135
)
(9
)
(3
)
(84
)
(231
)
Acquisitions
 
295

12

24

5

336

Increase (decrease) in existing provisions
 
137

428

1,492

1,303

3,360

Write-back of unused provisions
 
(2
)
(115
)
(21
)
(255
)
(393
)
Unwinding of discount
 
162

22

9

17

210

Change in discount ratea
 
(2,377
)
(38
)
(31
)
(17
)
(2,463
)
Utilization
 
(9
)
(245
)
(1,034
)
(528
)
(1,816
)
Reclassified to other payables
 
(270
)
(4
)
(2,051
)
(37
)
(2,362
)
Deletions
 
(288
)
—

(1
)
—

(289
)
At 31 December 2018
 
13,613

1,567

1,718

3,398

20,296

Of which – current
 
257

300

798

1,209

2,564

– non-current
 
13,356

1,267

920

2,189

17,732

Of which – Gulf of Mexico oil spillb
 
—

—

345

—

345

a 
Includes the impact of changing from a real to nominal discount rate. See Note 1 for further information.
b 
Further information on the financial impacts of the Gulf of Mexico oil spill is provided in Note 2.