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Income taxes (Details) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

12 Months Ended

Jun. 30, 2020

Mar. 31, 2020

Jun. 30, 2019

Jun. 30, 2020

Jun. 30, 2019

Dec. 31, 2019

Reconciliation of accounting profit multiplied by applicable tax rates [abstract]

Income/(loss) before tax

$ (720)

$ 81

$ 3,520

$ (640)

$ 8,401

$ 9,292

$ 469

$ (786)

$ (2,045)

$ (316)

$ (5,213)

$ (7,441)

^[1]

Effective tax rate

65.20%

58.10%

(49.50%)

62.10%

80.10%

Minimum [member]

Reconciliation of accounting profit multiplied by applicable tax rates [abstract]

Effective tax rate

100.00%

[1]

Audited

The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)]

+ References + Details