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Financial and capital risk management - Cash flow hedge and Protection program for product prices and input costs (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) oz T $ / T bbl | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) oz T $ / T bbl | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) oz T bbl
Derivative financial instruments. |  |  |  |  |
Financial settlement inflows (outflows) | $ 60 | $ (114) | $ (139) | $ 159 |
Forwards contract - Bunker Oil - bought |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Notional amount (bbl) | bbl | 990 |  | 990 |  | 1,625
Average strike per barrel |  |  | 23,302 |  |
Fair value of liabilities | $ 15 |  | $ 15 |  | $ 4
Financial settlement inflows (outflows) |  |  | 3 |  |
Value at risk | $ 15 |  | $ 15 |  |
Call options - Brent Crude Oil -bought |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Notional amount (bbl) | bbl | 4,488,809 |  | 4,488,809 |  | 13,746,945
Average strike per barrel |  |  | 55 |  |
Fair value of liabilities | $ 48 |  | $ 48 |  | $ 92
Financial settlement inflows (outflows) |  |  | 119 |  |
Value at risk | 7 |  | 7 |  |
Call options - Brent Crude Oil -bought | 2021+ |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Fair value of assets | $ 48 |  | $ 48 |  |
Put options - Brent Crude Oil - sold |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Notional amount (bbl) | bbl | 4,488,809 |  | 4,488,809 |  | 13,746,945
Average strike per barrel |  |  | 29 |  |
Fair value of liabilities |  |  |  |  | $ (12)
Call Options - Coal Revenue Hedging - Sold |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Notional amount (ton) | T | 600,000 |  | 600,000 |  |
Average strike per ton |  |  | 108 |  |
Fair value of assets | $ (10) |  | $ (10) |  |
Financial settlement inflows (outflows) |  |  | (2) |  |
Value at risk | 3 |  | 3 |  |
Call Options - Coal Revenue Hedging - Sold | 2021 |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Fair value of liabilities | $ (10) |  | $ (10) |  |
Put Options - Coal Revenue Hedging - Bought |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Notional amount (ton) | T | 390,000 |  | 390,000 |  |
Average strike per ton |  |  | 105 |  |
Fair value of assets | $ (1) |  | $ (1) |  |
Financial settlement inflows (outflows) |  |  | (1) |  |
Value at risk | 6 |  | 6 |  |
Put Options - Coal Revenue Hedging - Bought | 2021 |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Fair value of liabilities | (1) |  | (1) |  |
Coal Revenue Hedging Program |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Fair value of assets | (11) |  | (11) |  |
Financial settlement inflows (outflows) |  |  | (3) |  |
Value at risk | 9 |  | 9 |  |
Coal Revenue Hedging Program | 2021 |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Fair value of liabilities | $ (11) |  | $ (11) |  |
Call options - Nickel Revenue Hedging - Sold |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Notional amount (ton) | T | 35,120 |  | 35,120 |  | 58,620
Average strike per ton |  |  | 17,618 |  |
Fair value of assets | $ (41) |  | $ (41) |  | $ (46)
Financial settlement inflows (outflows) |  |  | (9) |  |
Value at risk | $ 10 |  | $ 10 |  |
Call options - Nickel Revenue Hedging - Sold | Minimum |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Price ensure in sales volum program (in USD per ton) | $ / T | 15,000 |  | 15,000 |  |
Call options - Nickel Revenue Hedging - Sold | Maximum |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Price ensure in sales volum program (in USD per ton) | $ / T | 17,618 |  | 17,618 |  |
Call options - Nickel Revenue Hedging - Sold | 2021 |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Fair value of liabilities | $ (41) |  | $ (41) |  |
Put options - Nickel Revenue Hedging - Bought |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Notional amount (ton) | T | 35,120 |  | 35,120 |  | 58,620
Average strike per ton |  |  | 15,000 |  |
Fair value of assets | $ 3 |  | $ 3 |  | $ 28
Value at risk | 1 |  | 1 |  |
Put options - Nickel Revenue Hedging - Bought | 2021 |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Fair value of liabilities | 3 |  | 3 |  |
Nickel Revenue Hedging Program |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Fair value of assets | (38) |  | (38) |  | $ (18)
Financial settlement inflows (outflows) |  |  | (9) |  |
Value at risk | 11 |  | 11 |  |
Nickel Revenue Hedging Program | 2021 |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Fair value of liabilities | $ (38) |  | $ (38) |  |
Call options - Palladium Revenue Hedging - Sold |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Notional amount (t oz) | oz | 67,362 |  | 67,362 |  | 7,200
Average strike per ton |  |  | 3,437 |  |
Fair value of assets | $ (11) |  | $ (11) |  | $ (1)
Value at risk | 3 |  | 3 |  |
Call options - Palladium Revenue Hedging - Sold | 2021 |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Fair value of liabilities | $ (11) |  | $ (11) |  |
Put options - Palladium Revenue Hedging - Bought |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Notional amount (t oz) | oz | 67,362 |  | 67,362 |  | 7,200
Average strike per ton |  |  | 2,397 |  |
Fair value of assets | $ 14 |  | $ 14 |  |
Value at risk | 3 |  | 3 |  |
Put options - Palladium Revenue Hedging - Bought | 2021 |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Fair value of liabilities | 14 |  | 14 |  |
Palladium Revenue Hedging Program |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Fair value of assets | 3 |  | 3 |  | $ (1)
Value at risk | 6 |  | 6 |  |
Palladium Revenue Hedging Program | 2021 |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Fair value of liabilities | $ 3 |  | $ 3 |  |

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