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Financial risk management and financial instruments - Contractual Cash Flows (Details) - ZAR (R) R in Millions | Jun. 30, 2018 | Jun. 30, 2017
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Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | R 51,467 | R 60,361
Contractual cash flows, non-derivative liabilities | (169,386) | (123,012)
Contractual cash flows, financial liabilities | (172,425) | (124,991)
Within one year |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 47,507 | 58,277
Contractual cash flows, non-derivative liabilities | (46,704) | (38,751)
Contractual cash flows, financial liabilities | (49,743) | (39,660)
One to five years |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 1,514 | 777
Contractual cash flows, non-derivative liabilities | (86,415) | (68,332)
Contractual cash flows, financial liabilities | (86,415) | (68,332)
More than five years |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 2,446 | 1,307
Contractual cash flows, non-derivative liabilities | (36,267) | (15,929)
Contractual cash flows, financial liabilities | (36,267) | (16,999)
Long-term debt |  |
Financial risk management and financial instruments |  |
Contractual cash flows, non-derivative liabilities | (139,294) | (94,044)
Long-term debt | Within one year |  |
Financial risk management and financial instruments |  |
Contractual cash flows, non-derivative liabilities | (16,612) | (9,783)
Long-term debt | One to five years |  |
Financial risk management and financial instruments |  |
Contractual cash flows, non-derivative liabilities | (86,415) | (68,332)
Long-term debt | More than five years |  |
Financial risk management and financial instruments |  |
Contractual cash flows, non-derivative liabilities | (36,267) | (15,929)
Short-term debt |  |
Financial risk management and financial instruments |  |
Contractual cash flows, non-derivative liabilities | (1,946) | (2,625)
Short-term debt | Within one year |  |
Financial risk management and financial instruments |  |
Contractual cash flows, non-derivative liabilities | (1,946) | (2,625)
Trade and other payables |  |
Financial risk management and financial instruments |  |
Contractual cash flows, non-derivative liabilities | (26,518) | (26,131)
Trade and other payables | Within one year |  |
Financial risk management and financial instruments |  |
Contractual cash flows, non-derivative liabilities | (26,518) | (26,131)
Bank overdraft |  |
Financial risk management and financial instruments |  |
Contractual cash flows, non-derivative liabilities | (89) | (123)
Bank overdraft | Within one year |  |
Financial risk management and financial instruments |  |
Contractual cash flows, non-derivative liabilities | (89) | (123)
Financial guarantees |  |
Financial risk management and financial instruments |  |
Contractual cash flows, non-derivative liabilities | (1,539) | (89)
Financial guarantees | Within one year |  |
Financial risk management and financial instruments |  |
Contractual cash flows, non-derivative liabilities | (1,539) | (89)
Foreign exchange contracts |  |
Financial risk management and financial instruments |  |
Contractual cash flows, derivative liabilities | (1,217) | (904)
Foreign exchange contracts | Within one year |  |
Financial risk management and financial instruments |  |
Contractual cash flows, derivative liabilities | (1,217) | (904)
Coal swaps |  |
Financial risk management and financial instruments |  |
Contractual cash flows, derivative liabilities | (414) | (2)
Coal swaps | Within one year |  |
Financial risk management and financial instruments |  |
Contractual cash flows, derivative liabilities | (414) | (2)
Zero cost collar |  |
Financial risk management and financial instruments |  |
Contractual cash flows, derivative liabilities | (1,317) | (3)
Zero cost collar | Within one year |  |
Financial risk management and financial instruments |  |
Contractual cash flows, derivative liabilities | (1,317) | (3)
Crude oil futures |  |
Financial risk management and financial instruments |  |
Contractual cash flows, derivative liabilities | (91) |
Crude oil futures | Within one year |  |
Financial risk management and financial instruments |  |
Contractual cash flows, derivative liabilities | (91) |
Interest rate swap |  |
Financial risk management and financial instruments |  |
Contractual cash flows, derivative liabilities |  | (1,070)
Interest rate swap | More than five years |  |
Financial risk management and financial instruments |  |
Contractual cash flows, derivative liabilities |  | (1,070)
Non-derivative instruments |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 48,513 | 57,111
Non-derivative instruments | Within one year |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 44,799 | 55,027
Non-derivative instruments | One to five years |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 1,514 | 777
Non-derivative instruments | More than five years |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 2,200 | 1,307
Long-term receivables |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 3,786 | 2,003
Long-term receivables | Within one year |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 97 |
Long-term receivables | One to five years |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 1,489 | 696
Long-term receivables | More than five years |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 2,200 | 1,307
Trade and other receivables |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 26,648 | 24,675
Trade and other receivables | Within one year |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 26,648 | 24,675
Cash restricted for use |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 1,980 | 1,803
Cash restricted for use | Within one year |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 1,980 | 1,803
Cash |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 15,148 | 27,643
Cash | Within one year |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 15,148 | 27,643
Investments in financial assets | Assets, Available-for-sale |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 926 | 906
Investments in financial assets | Assets, Available-for-sale | Within one year |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 926 | 906
Investments in financial assets | Assets, Held-to-maturity |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 25 | 81
Investments in financial assets | Assets, Held-to-maturity | One to five years |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 25 | 81
Foreign exchange contracts |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 1,214 | 515
Foreign exchange contracts | Within one year |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 1,214 | 515
Interest rate swap |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 246 |
Interest rate swap | More than five years |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 246 |
Zero cost collar |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 979 | 1,546
Zero cost collar | Within one year |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 979 | 1,546
Crude oil options |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 482 | 1,116
Crude oil options | Within one year |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 482 | 1,116
Ethane swaps |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | 33 |
Ethane swaps | Within one year |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets | R 33 |
Crude oil futures |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets |  | 52
Crude oil futures | Within one year |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets |  | 52
Coal swaps |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets |  | 21
Coal swaps | Within one year |  |
Financial risk management and financial instruments |  |
Contractual cash flows, financial assets |  | R 21

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