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Operating segments - Reconciliation of net earnings/(losses) to underlying earnings (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Reconciliation Of Net Earnings Losses To Underlying Earnings [Abstract] |  |  |
Impairment charges, Pre-tax | $ (132) |  |
Net gains on consolidation and disposal of interests in businesses, Pre-tax | 4,622 |  |
Exchange and derivative gains/(losses), Pre-tax |  |  |
– Exchange (losses)/gains on external US dollar net debt and intragroup balances and derivatives, Pre-tax | 694 |  |
Gain/(losses) on currency and interest rate derivatives not qualifying for hedge accounting, Pre-tax | (59) |  |
(Losses)/gains on embedded commodity derivatives not qualifying for hedge accounting, Pre-tax | 288 |  |
Losses from increases to closure estimates (non-operating and fully impaired sites), Pre-tax | (376) |  |
Gain relating to surplus land at Kitimat, Pre-tax | 602 |  |
Total excluded from underlying earnings, Pre-tax | 5,639 |  |
Net earnings, Pre-tax | 18,167 | $ 12,816 | $ 6,343
Underlying earnings, Pre-tax | 12,528 |  |
Impairment charges, Tax | 25 |  |
Net gains on consolidation and disposal of interests in businesses, Tax | (626) |  |
– Exchange (losses)/gains on external US dollar net debt and intragroup balances and derivatives, Tax | (136) |  |
- Gain/(losses) on currency and interest rate derivatives not qualifying for hedge accounting, Tax | 11 |  |
- (Losses)/gains on embedded commodity derivatives not qualifying for hedge accounting, Tax | (83) |  |
Losses from increases to closure estimates (non-operating and fully impaired sites), Tax | 41 |  |
Gain relating to surplus land at Kitimat, Tax | (33) |  |
Tax provision |  |  | (380)
Tax charge relating to expected divestments, Tax |  | (202) |
Total excluded from underlying earnings, Tax | (801) |  |
Taxation | (4,242) | (3,965) | (1,567)
Underlying earnings, Tax | (3,441) |  |
Impairment charges, Non-controlling interests | 3 |  |
Exchange and derivative gains/(losses, Non-controlling interests |  |  |
– Exchange (losses)/gains on external US dollar net debt and intragroup balances and drivatives, Non-controlling interests | (8) |  |
Total excluded from underlying earnings, Non-controlling interests | (8) |  |
Net earnings, Non-controlling interests | (287) | (89) | (159)
Underlying earnings, Non-controlling interests | (279) |  |
Impairment charges, Net | (104) | (481) | (183)
Net gains on consolidation and disposal of interests in businesses, Net | 3,996 | 2,022 | 382
Exchange and derivative gains/(losses), Net |  |  |
– Exchange (losses)/gains on external US dollar net debt and intragroup balances and derivatives, Net | 550 | (488) | 516
- Gain/(losses) on currency and interest rate derivatives not qualifying for hedge accounting, Net | (48) | 30 | (12)
- (Losses)/gains on embedded commodity derivatives not qualifying for hedge accounting, Net | 202 | (352) | 32
Losses from increases to closure estimates (non-operating and fully impaired sites), Net | (335) |  | (282)
Gain relating to surplus land at Kitimat, Net | 569 |  |
Changes in corporate tax rates in the US and France, Net |  | (439) |
Onerous port and rail contracts, Net |  |  | (329)
Restructuring costs and global headcount reductions, Net |  |  | (177)
Rio Tinto Kennecott insurance settlement, Net |  | 45 |
Tax charge relating to expected divestments, Net |  | (202) |
Other exclusions, Net |  |  | (50)
Total excluded from underlying earnings, Net | 4,830 | 135 | (483)
– attributable to owners of Rio Tinto (net earnings) | 13,638 | 8,762 | 4,617
Underlying earnings, Net | $ 8,808 | $ 8,627 | $ 5,100

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