Revenues - Summary of Breakdown of Revenues by Type of Good or Service (Detail) - ARS ($)
$ in Millions

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Disclosure of revenue [line items]

Sales of goods and services

$ 435,558

$ 243,230

$ 194,782

Gas oil [member]

Disclosure of revenue [line items]

Sales of goods and services

132,073

76,082

65,328

Gasolines [member]

Disclosure of revenue [line items]

Sales of goods and services

97,093

59,230

46,254

Natural gas [member]

Disclosure of revenue [line items]

Sales of goods and services

80,433

40,070

26,198

Crude oil [member]

Disclosure of revenue [line items]

Sales of goods and services

3,477

1,190

2,135

Jet fuel [member]

Disclosure of revenue [line items]

Sales of goods and services

25,999

11,233

7,689

Lubricants and by-products [member]

Disclosure of revenue [line items]

Sales of goods and services

8,928

5,956

4,746

Liquefied petroleum gas [member]

Disclosure of revenue [line items]

Sales of goods and services

12,542

6,287

4,151

Fuel oil [member]

Disclosure of revenue [line items]

Sales of goods and services

3,354

5,717

11,099

Petrochemicals [member]

Disclosure of revenue [line items]

Sales of goods and services

16,239

8,437

6,418

Fertilizers [member]

Disclosure of revenue [line items]

Sales of goods and services

4,231

2,011

1,450

Flours, oils and grains [member]

Disclosure of revenue [line items]

Sales of goods and services

7,917

6,542

5,200

Asphalts [member]

Disclosure of revenue [line items]

Sales of goods and services

4,129

3,014

1,186

Goods for resale at gas stations [member]

Disclosure of revenue [line items]

Sales of goods and services

3,381

2,362

1,839

Income from services [member]

Disclosure of revenue [line items]

Sales of goods and services

1,344

1,007

584

Income from construction contracts [member]

Disclosure of revenue [line items]

Sales of goods and services

5,551

879

1,193

Virgin naphtha [member]

Disclosure of revenue [line items]

Sales of goods and services

3,999

1,148

512

Petroleum coke [member]

Disclosure of revenue [line items]

Sales of goods and services

6,139

1,697

1,192

LNG Regasification [member]

Disclosure of revenue [line items]

Sales of goods and services

3,359

2,731

2,479

Other goods and services [member]

Disclosure of revenue [line items]

Sales of goods and services

15,370

7,637

5,129

Upstream [member]

Disclosure of revenue [line items]

Sales of goods and services

3,181

774

4,503

Upstream [member] | Natural gas [member]

Disclosure of revenue [line items]

Sales of goods and services

2,681

Upstream [member] | Crude oil [member]

Disclosure of revenue [line items]

Sales of goods and services

1,075

Upstream [member] | Liquefied petroleum gas [member]

Disclosure of revenue [line items]

Sales of goods and services

162

Upstream [member] | Other goods and services [member]

Disclosure of revenue [line items]

Sales of goods and services

3,181

774

585

Downstream [member]

Disclosure of revenue [line items]

Sales of goods and services

336,569

195,235

160,914

Downstream [member] | Gas oil [member]

Disclosure of revenue [line items]

Sales of goods and services

132,073

76,082

65,328

Downstream [member] | Gasolines [member]

Disclosure of revenue [line items]

Sales of goods and services

97,093

59,230

46,254

Downstream [member] | Natural gas [member]

Disclosure of revenue [line items]

Sales of goods and services

1,000

655

618

Downstream [member] | Crude oil [member]

Disclosure of revenue [line items]

Sales of goods and services

3,477

1,190

1,060

Downstream [member] | Jet fuel [member]

Disclosure of revenue [line items]

Sales of goods and services

25,999

11,233

7,689

Downstream [member] | Lubricants and by-products [member]

Disclosure of revenue [line items]

Sales of goods and services

8,928

5,956

4,746

Downstream [member] | Liquefied petroleum gas [member]

Disclosure of revenue [line items]

Sales of goods and services

12,542

6,287

3,989

Downstream [member] | Fuel oil [member]

Disclosure of revenue [line items]

Sales of goods and services

3,354

5,717

11,099

Downstream [member] | Petrochemicals [member]

Disclosure of revenue [line items]

Sales of goods and services

16,239

8,437

6,418

Downstream [member] | Fertilizers [member]

Disclosure of revenue [line items]

Sales of goods and services

4,231

2,011

1,450

Downstream [member] | Flours, oils and grains [member]

Disclosure of revenue [line items]

Sales of goods and services

7,917

6,542

5,200

Downstream [member] | Asphalts [member]

Disclosure of revenue [line items]

Sales of goods and services

4,129

3,014

1,186

Downstream [member] | Goods for resale at gas stations [member]

Disclosure of revenue [line items]

Sales of goods and services

3,381

2,362

1,839

Downstream [member] | Virgin naphtha [member]

Disclosure of revenue [line items]

Sales of goods and services

3,999

1,148

512

Downstream [member] | Petroleum coke [member]

Disclosure of revenue [line items]

Sales of goods and services

6,139

1,697

1,192

Downstream [member] | Other goods and services [member]

Disclosure of revenue [line items]

Sales of goods and services

6,068

3,674

2,334

Gas and energy [member]

Disclosure of revenue [line items]

Sales of goods and services

86,883

44,408

26,801

Gas and energy [member] | Natural gas [member]

Disclosure of revenue [line items]

Sales of goods and services

79,433

39,415

22,899

Gas and energy [member] | LNG Regasification [member]

Disclosure of revenue [line items]

Sales of goods and services

3,359

2,731

2,479

Gas and energy [member] | Other goods and services [member]

Disclosure of revenue [line items]

Sales of goods and services

4,091

2,262

1,423

Corporation and others [member]

Disclosure of revenue [line items]

Sales of goods and services

8,925

2,813

2,564

Corporation and others [member] | Income from services [member]

Disclosure of revenue [line items]

Sales of goods and services

1,344

1,007

584

Corporation and others [member] | Income from construction contracts [member]

Disclosure of revenue [line items]

Sales of goods and services

5,551

879

1,193

Corporation and others [member] | Other goods and services [member]

Disclosure of revenue [line items]

Sales of goods and services

$ 2,030

$ 927

$ 787