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Financial risk management and financial instruments - Contractual Cash Flows (Details) - ZAR (R)
R in Millions
Jun. 30, 2019
Jun. 30, 2018
Financial risk management and financial instruments    
Contractual cash flows, financial assets R 48,629 R 49,487
Contractual cash flows, non-derivative liabilities (214,569) (169,386)
Contractual cash flows, financial liabilities (218,743) (172,425)
Within one year    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 42,464 45,430
Contractual cash flows, non-derivative liabilities (39,356) (46,704)
Contractual cash flows, financial liabilities (42,255) (49,743)
One to five years    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 4,779 1,611
Contractual cash flows, non-derivative liabilities (138,453) (86,415)
Contractual cash flows, financial liabilities (139,482) (86,415)
More than five years    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 1,386 2,446
Contractual cash flows, non-derivative liabilities (36,760) (36,267)
Contractual cash flows, financial liabilities (37,006) (36,267)
Long-term debt    
Financial risk management and financial instruments    
Contractual cash flows, non-derivative liabilities (183,445) (139,294)
Long-term debt | Within one year    
Financial risk management and financial instruments    
Contractual cash flows, non-derivative liabilities (8,232) (16,612)
Long-term debt | One to five years    
Financial risk management and financial instruments    
Contractual cash flows, non-derivative liabilities (138,453) (86,415)
Long-term debt | More than five years    
Financial risk management and financial instruments    
Contractual cash flows, non-derivative liabilities (36,760) (36,267)
Bonds, revolving credit facility and term loan | One to five years    
Financial risk management and financial instruments    
Contractual cash flows, non-derivative liabilities (131,000)  
Short-term debt    
Financial risk management and financial instruments    
Contractual cash flows, non-derivative liabilities (1,239) (1,946)
Short-term debt | Within one year    
Financial risk management and financial instruments    
Contractual cash flows, non-derivative liabilities (1,239) (1,946)
Trade and other payables    
Financial risk management and financial instruments    
Contractual cash flows, non-derivative liabilities (28,501) (26,518)
Trade and other payables | Within one year    
Financial risk management and financial instruments    
Contractual cash flows, non-derivative liabilities (28,501) (26,518)
Bank overdraft    
Financial risk management and financial instruments    
Contractual cash flows, non-derivative liabilities (58) (89)
Bank overdraft | Within one year    
Financial risk management and financial instruments    
Contractual cash flows, non-derivative liabilities (58) (89)
Financial guarantees    
Financial risk management and financial instruments    
Contractual cash flows, non-derivative liabilities (1,326) (1,539)
Financial guarantees | Within one year    
Financial risk management and financial instruments    
Contractual cash flows, non-derivative liabilities (1,326) (1,539)
Foreign exchange contracts    
Financial risk management and financial instruments    
Contractual cash flows, derivative liabilities (2,190) (1,217)
Foreign exchange contracts | Within one year    
Financial risk management and financial instruments    
Contractual cash flows, derivative liabilities (2,190) (1,217)
Interest rate swaps    
Financial risk management and financial instruments    
Contractual cash flows, derivative liabilities (1,488)  
Interest rate swaps | Within one year    
Financial risk management and financial instruments    
Contractual cash flows, derivative liabilities (213)  
Interest rate swaps | One to five years    
Financial risk management and financial instruments    
Contractual cash flows, derivative liabilities (1,029)  
Interest rate swaps | More than five years    
Financial risk management and financial instruments    
Contractual cash flows, derivative liabilities (246)  
Coal swaps    
Financial risk management and financial instruments    
Contractual cash flows, derivative liabilities   (414)
Coal swaps | Within one year    
Financial risk management and financial instruments    
Contractual cash flows, derivative liabilities   (414)
Zero-cost collar    
Financial risk management and financial instruments    
Contractual cash flows, derivative liabilities (3) (1,317)
Zero-cost collar | Within one year    
Financial risk management and financial instruments    
Contractual cash flows, derivative liabilities (3) (1,317)
Ethane swaps    
Financial risk management and financial instruments    
Contractual cash flows, derivative liabilities (456)  
Ethane swaps | Within one year    
Financial risk management and financial instruments    
Contractual cash flows, derivative liabilities (456)  
Crude oil futures    
Financial risk management and financial instruments    
Contractual cash flows, derivative liabilities (27) (91)
Crude oil futures | Within one year    
Financial risk management and financial instruments    
Contractual cash flows, derivative liabilities (27) (91)
Other commodity derivatives    
Financial risk management and financial instruments    
Contractual cash flows, derivative liabilities (10)  
Other commodity derivatives | Within one year    
Financial risk management and financial instruments    
Contractual cash flows, derivative liabilities (10)  
Non-derivative instruments    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 45,838 46,533
Non-derivative instruments | Within one year    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 39,688 42,722
Non-derivative instruments | One to five years    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 4,771 1,611
Non-derivative instruments | More than five years    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 1,379 2,200
Long-term receivables    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 5,582 3,786
Long-term receivables | One to five years    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 4,203 1,586
Long-term receivables | More than five years    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 1,379 2,200
Trade and other receivables    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 25,611 26,648
Trade and other receivables | Within one year    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 25,611 26,648
Cash and cash equivalents (excluding restricted cash)    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 13,397 15,148
Cash and cash equivalents (excluding restricted cash) | Within one year    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 13,397 15,148
Investments in financial assets | Assets, Available-for-sale    
Financial risk management and financial instruments    
Contractual cash flows, financial assets   926
Investments in financial assets | Assets, Available-for-sale | Within one year    
Financial risk management and financial instruments    
Contractual cash flows, financial assets   926
Investments in financial assets | Assets, Held-to-maturity    
Financial risk management and financial instruments    
Contractual cash flows, financial assets   25
Investments in financial assets | Assets, Held-to-maturity | One to five years    
Financial risk management and financial instruments    
Contractual cash flows, financial assets   25
Investments in financial assets | Assets, Designated at fair value through other comprehensive income    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 1,223  
Investments in financial assets | Assets, Designated at fair value through other comprehensive income | Within one year    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 680  
Investments in financial assets | Assets, Designated at fair value through other comprehensive income | One to five years    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 543  
Other long-term investments    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 25  
Other long-term investments | One to five years    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 25  
Foreign exchange contracts    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 2,161 1,214
Foreign exchange contracts | Within one year    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 2,161 1,214
Interest rate swaps    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 15 246
Interest rate swaps | One to five years    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 8  
Interest rate swaps | More than five years    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 7 246
Zero-cost collar    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 582 979
Zero-cost collar | Within one year    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 582 979
Crude oil options    
Financial risk management and financial instruments    
Contractual cash flows, financial assets   482
Crude oil options | Within one year    
Financial risk management and financial instruments    
Contractual cash flows, financial assets   482
Ethane swaps    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 2 33
Ethane swaps | Within one year    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 2 R 33
Other commodity derivatives    
Financial risk management and financial instruments    
Contractual cash flows, financial assets 31  
Other commodity derivatives | Within one year    
Financial risk management and financial instruments    
Contractual cash flows, financial assets R 31