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Gulf of Mexico oil spill (Tables)
 6 Months Ended
Jun. 30, 2018
Significant Events [Abstract]  
Summary of impacts of the Gulf of Mexico oil spill on the income statement, balance sheet and cash flow statement
The income statement, balance sheet and cash flow statement impacts are included within the relevant line items in those statements as set out below.

 
 
Second

Second

 
First

First

 
 
quarter

quarter

 
half

half

$ million
 
2018

2017

 
2018

2017

Income statement
 
 
 
 
 
 
Production and manufacturing expenses
 
433

347

 
519

382

Profit (loss) before interest and taxation
 
(433
)
(347
)
 
(519
)
(382
)
Finance costs
 
118

121

 
238

247

Profit (loss) before taxation
 
(551
)
(468
)
 
(757
)
(629
)
Taxation
 
106

154

 
167

202

Profit (loss) for the period
 
(445
)
(314
)
 
(590
)
(427
)
The cumulative pre-tax income statement charge since the incident, in April 2010, amounts to $66,522 million.
 
 
30 June

31 December

$ million
 
2018

2017

Balance sheet
 
 
 
Current assets
 
 
 
Trade and other receivables
 
207

252

Current liabilities
 
 
 
Trade and other payables
 
(2,464
)
(2,089
)
Provisions
 
(253
)
(1,439
)
Net current assets (liabilities)
 
(2,510
)
(3,276
)
Non-current assets
 
 
 
Deferred tax assets
 
1,775

2,067

Non-current liabilities
 
 
 
Other payables
 
(12,047
)
(12,253
)
Provisions
 
(172
)
(1,141
)
Deferred tax liabilities
 
3,816

3,634

Net non-current assets (liabilities)
 
(6,628
)
(7,693
)
Net assets (liabilities)
 
(9,138
)
(10,969
)

 
 
Second

Second

 
First

First

 
 
quarter

quarter

 
half

half

$ million
 
2018

2017

 
2018

2017

Cash flow statement - Operating activities
 
 
 
 
 
 
Profit (loss) before taxation
 
(551
)
(468
)
 
(757
)
(629
)
Adjustments to reconcile profit (loss) before taxation to net cash provided by operating activities
 
 
 
 
 
 
Net charge for interest and other finance expense, less net interest paid
 
118

121

 
238

247

Net charge for provisions, less payments
 
48

298

 
102

293

Movements in inventories and other current and non-current assets and liabilities
 
(693
)
(1,976
)
 
(2,281
)
(4,230
)
Pre-tax cash flows
 
(1,078
)
(2,025
)
 
(2,698
)
(4,319
)
Summary of movements in each class of provisions
Movements in the remaining provision, which relates to litigation and claims, are shown in the table below.
$ million 
 
 
At 1 April 2018
 
2,231

Net increase in provision
 
411

Reclassified to other payables
 
(1,816
)
Utilization
 
(401
)
At 30 June 2018
 
425

Movements in the remaining provision, which relates to litigation and claims, for the half year are shown in the table below.
$ million 
 
 
At 1 January 2018
 
2,580

Net increase in provision
 
476

Reclassified to other payables
 
(1,875
)
Utilization
 
(756
)
At 30 June 2018
 
425