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Provisions (Tables)
 12 Months Ended
Dec. 31, 2019
Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]  
Summary of movements in each class of provisions
 
 
 
 
 
 
$ million

 
 
Decommissioning

Environmental

Litigation and claims

Other

Total

At 1 January 2019a
 
13,613

1,567

1,718

3,306

20,204

Exchange adjustments
 
74

(1
)
—

(19
)
54

Acquisitions
 
13

—

47

22

82

Increase (decrease) in existing provisions
 
1,045

272

290

960

2,567

Write-back of unused provisions
 
(22
)
(43
)
(15
)
(361
)
(441
)
Unwinding of discount
 
415

45

28

17

505

Change in discount rate
 
1,360

40

31

11

1,442

Utilization
 
(9
)
(252
)
(674
)
(665
)
(1,600
)
Reclassified to other payables
 
(187
)
—

(139
)
(328
)
(654
)
Reclassified as liabilities directly associated with assets held for sale
 
(1,004
)
(8
)
—

—

(1,012
)
Deletions
 
(188
)
—

(5
)
(3
)
(196
)
At 31 December 2019
 
15,110

1,620

1,281

2,940

20,951

Of which – current
 
317

280

558

1,298

2,453

– non-current
 
14,793

1,340

723

1,642

18,498

Of which – Gulf of Mexico oil spill
 
—

—

189

—

189

a Includes adjustment of $92 million for the implementation of IFRS 16. See Note 1 for further information.