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Significant accounting policies, judgements, estimates and assumptions (Tables)
 12 Months Ended
Dec. 31, 2019
Corporate Information And Statement Of IFRS Compliance [Abstract]  
Summary of typical useful lives of other property, plant and equipment
The typical useful lives of the group’s other property, plant and equipment are as follows:
Land improvements
15 to 25 years
Buildings
20 to 50 years
Refineries
20 to 30 years
Petrochemicals plants
20 to 30 years
Pipelines
10 to 50 years
Service stations
15 years
Office equipment
3 to 7 years
Fixtures and fittings
5 to 15 years
 
 
 
 
 
 
 
 
 
$ million

 
 
Land and land improvements

Buildings

Oil and gas propertiesa

Plant, machinery and equipment

Fittings, fixtures and office equipment

Transportationb

Oil depots, storage tanks and service stations

Total

Cost - owned property, plant and equipment (PP&E)
 
 
 
 
 
 
 
 
 
At 1 January 2019
 
3,562

1,502

232,684

45,721

2,747

10,183

8,866

305,265

Exchange adjustments
 
(22
)
5

—

(158
)
15

(3
)
(69
)
(232
)
Additions
 
88

93

13,237

2,433

172

274

644

16,941

Acquisitions
 
51

—

—

—

—

—

8

59

Transfers from intangible assets
 
—

—

1,885

—

—

—

—

1,885

Reclassified as assets held for sale
 
(26
)
—

(22,602
)
—

(76
)
(6,708
)
—

(29,412
)
Deletions
 
(44
)
(178
)
(10,852
)
(1,272
)
(326
)
(272
)
(755
)
(13,699
)
At 31 December 2019
 
3,609

1,422

214,352

46,724

2,532

3,474

8,694

280,807

Depreciation - owned PP&E
 
 
 
 
 
 
 
 
 
At 1 January 2019
 
626

697

133,687

20,512

2,041

7,819

5,146

170,528

Exchange adjustments
 
(4
)
5

—

(63
)
12

(3
)
(45
)
(98
)
Charge for the year
 
44

59

13,012

1,705

168

173

420

15,581

Impairment losses
 
1

1

5,871

64

1

404

4

6,346

Impairment reversals
 
—

—

(129
)
—

—

(2
)
—

(131
)
Reclassified as assets held for sale
 
—

—

(17,764
)
—

(69
)
(5,478
)
—

(23,311
)
Deletions
 
(86
)
(65
)
(9,911
)
(691
)
(147
)
(169
)
(660
)
(11,729
)
At 31 December 2019
 
581

697

124,766

21,527

2,006

2,744

4,865

157,186

Owned PP&E - net book amount at 31 December 2019
 
3,028

725

89,586

25,197

526

730

3,829

123,621

Right-of-use assets - net book amount at 31 December 2019c
 
—

1,196

128

1,241

16

3,385

3,055

9,021

Total PP&E - net book amount at 31 December 2019
 
3,028

1,921

89,714

26,438

542

4,115

6,884

132,642

Cost
 
 
 
 
 
 
 
 
 
At 1 January 2018
 
3,474

1,573

226,054

46,662

2,853

10,774

8,748

300,138

Exchange adjustments
 
(168
)
(58
)
—

(892
)
(73
)
(43
)
(501
)
(1,735
)
Additions
 
233

40

9,712

2,323

204

(112
)
736

13,136

Acquisitions
 
163

4

10,882

9

1

2

36

11,097

Remeasurementsb
 
—

—

17

—

—

—

—

17

Transfers from intangible assets
 
—

—

901

—

—

—

—

901

Deletions
 
(140
)
(45
)
(14,699
)
(1,810
)
(238
)
(128
)
(146
)
(17,206
)
At 31 December 2018
 
3,562

1,514

232,867

46,292

2,747

10,493

8,873

306,348

Depreciation
 
 
 
 
 
 
 
 
 
At 1 January 2018
 
683

818

133,326

20,996

2,136

7,523

5,185

170,667

Exchange adjustments
 
(25
)
(24
)
—

(460
)
(52
)
(27
)
(279
)
(867
)
Charge for the year
 
92

52

12,342

1,820

189

252

384

15,131

Impairment losses
 
2

—

86

253

—

178

2

521

Impairment reversals
 
—

—

(564
)
(1
)
—

(17
)
—

(582
)
Deletions
 
(126
)
(139
)
(11,333
)
(1,733
)
(232
)
(75
)
(145
)
(13,783
)
At 31 December 2018
 
626

707

133,857

20,875

2,041

7,834

5,147

171,087

Net book amount at 31 December 2018
 
2,936

807

99,010

25,417

706

2,659

3,726

135,261

 
 
 
 
 
 
 
 
 
 
Assets held under finance leases at net book amount included aboved
 
 
 
 
 
 
 
 
 
At 31 December 2018
 
—

2

12

207

—

295

6

522

Assets under construction included above
 
 
 
 
 
 
 
 
 
At 31 December 2019
 
 
 
 
 
 
 
 
23,897

At 31 December 2018
 
 
 
 
 
 
 
 
22,522

Depreciation charge for the year on right-of-use assets
 
 
 
 
 
 
 
 
 
2019
 

220

31

671

9

784

526

2,241

a For information on significant estimates and judgements made in relation to the estimation of oil and natural reserves see Property, plant and equipment within Note 1.
b 
Includes adjustments to decommissioning provisions; see Note 1 for further information.
c $653 million of drilling rig right-of-use assets and $2,929 million of shipping vessel right-of-use assets are included in Plant, machinery and equipment and Transportation respectively.
d Leases previously classified as finance leases are included within right-of-use assets following the implementation of IFRS 16 ‘Leases’; see Note 1 for further information. The reconciliation of owned property, plant and equipment for 2019 does not include right-of-use assets and, therefore, the cost and depreciation at 1 January 2019 is not equal to the cost and depreciation of total property, plant and equipment at 31 December 2018. The relevant amounts excluded are cost of $1,083 million and depreciation of $559 million relating to leases previously classified as finance leases.
Disclosure of initial application of standards or interpretations [text block]
The following table provides a reconciliation of the operating lease commitments as at 31 December 2018 to the total lease liability recognized on the group balance sheet in accordance with IFRS 16 as at 1 January 2019, with explanations below.
 
 
$ million

 
 
 
Operating lease commitments at 31 December 2018
 
11,979

 
 
 
Leases not yet commenced
 
(1,372
)
Leases below materiality threshold
 
(86
)
Short-term leases
 
(91
)
Effect of discounting
 
(1,512
)
Impact on leases in joint operations
 
836

Variable lease payments
 
(58
)
Redetermination of lease term
 
(252
)
Other
 
(22
)
Total additional lease liabilities recognized on adoption of IFRS 16
 
9,422

Finance lease obligations at 31 December 2018
 
667

Adjustment for finance leases in joint operations
 
(189
)
Total lease liabilities at 1 January 2019
 
9,900

In addition to the lease liability, other line items on the group balance sheet adjusted on transition to IFRS 16 include property, plant and equipment for the right-of-use assets, lease related prepayments, receivables from joint operation partners, accruals, payables to operators of joint operations, onerous lease provisions and deferred tax balances, as set out below.
 
 
 
 
$ million

 
 
31 December 2018

1 January 2019

Adjustment on adoption of IFRS 16

Non-current assets
 
 
 
 
Property, plant and equipment
 
135,261

143,950

8,689

Trade and other receivables
 
1,834

2,159

325

Prepayments
 
1,179

849

(330
)
Deferred tax assets
 
3,706

3,736

30

Current assets
 
 
 
 
Trade and other receivables
 
24,478

24,673

195

Prepayments
 
963

872

(91
)
Current liabilities
 
 
 
 
Trade and other payables
 
46,265

46,209

(56
)
Accruals
 
4,626

4,578

(48
)
Lease liabilities
 
44

2,196

2,152

Finance debt
 
9,329

9,329

—

Provisions
 
2,564

2,547

(17
)
Non-current liabilities
 
 
 
 
Other payables
 
13,830

14,013

183

Accruals
 
575

548

(27
)
Lease liabilities
 
623

7,704

7,081

Finance debt
 
55,803

55,803

—

Deferred tax liabilities
 
9,812

9,767

(45
)
Provisions
 
17,732

17,657

(75
)
 
 
 
 
 
Net assetsa
 
101,548

101,218

(330
)
 
 
 
 
 
Equity
 
 
 
 
BP shareholders' equity
 
99,444

99,115

(329
)
Non-controlling interests
 
2,104

2,103

(1
)
 
 
101,548

101,218

(330
)
a Net assets also includes the line items not affected by the transition to IFRS 16 that are not presented separately in the table

The total adjustments to the group's lease liabilities at 1 January 2019 are reconciled as follows:
 
 
$ million

 
 
 
Total additional lease liabilities recognized on adoption of IFRS 16
 
9,422

Less: adjustment for finance leases in joint operations
 
(189
)
Total adjustment to lease liabilities
 
9,233

Of which – current
 
2,152

– non-current
 
7,081