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FINANCIAL INSTRUMENTS - Scheduled Debt Repayments (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings $ 4,690
Gross lease liabilities 59
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 4,690
Gross lease liabilities 59
7.73% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 6
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 6
7.70% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 5
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 5
7.37% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 32
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 32
8.05% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 15
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 15
6.38% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 200
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 200
5.80% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 200
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 200
5.80% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 200
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 200
6.45% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 300
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 300
6.35% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 600
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 600
7.50% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 250
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 250
5.95% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 807
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 807
5.7% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 850
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 850
5.25% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 375
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 375
5.75% Notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 850
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 850
Not later than one year [member]  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 11
Gross lease liabilities 13
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 11
Gross lease liabilities 13
Not later than one year [member] | 7.73% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 6
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 6
Not later than one year [member] | 7.70% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 5
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 5
Not later than one year [member] | 7.37% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Not later than one year [member] | 8.05% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Not later than one year [member] | 6.38% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Not later than one year [member] | 5.80% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Not later than one year [member] | 5.80% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Not later than one year [member] | 6.45% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Not later than one year [member] | 6.35% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Not later than one year [member] | 7.50% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Not later than one year [member] | 5.95% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Not later than one year [member] | 5.7% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Not later than one year [member] | 5.25% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Not later than one year [member] | 5.75% Notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than one year and not later than two years [member]  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 47
Gross lease liabilities 11
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 47
Gross lease liabilities 11
Later than one year and not later than two years [member] | 7.73% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than one year and not later than two years [member] | 7.70% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than one year and not later than two years [member] | 7.37% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 32
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 32
Later than one year and not later than two years [member] | 8.05% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 15
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 15
Later than one year and not later than two years [member] | 6.38% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than one year and not later than two years [member] | 5.80% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than one year and not later than two years [member] | 5.80% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than one year and not later than two years [member] | 6.45% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than one year and not later than two years [member] | 6.35% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than one year and not later than two years [member] | 7.50% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than one year and not later than two years [member] | 5.95% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than one year and not later than two years [member] | 5.7% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than one year and not later than two years [member] | 5.25% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than one year and not later than two years [member] | 5.75% Notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than two years and not later than three years [member]  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Gross lease liabilities 11
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Gross lease liabilities 11
Later than two years and not later than three years [member] | 7.73% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than two years and not later than three years [member] | 7.70% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than two years and not later than three years [member] | 7.37% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than two years and not later than three years [member] | 8.05% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than two years and not later than three years [member] | 6.38% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than two years and not later than three years [member] | 5.80% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than two years and not later than three years [member] | 5.80% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than two years and not later than three years [member] | 6.45% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than two years and not later than three years [member] | 6.35% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than two years and not later than three years [member] | 7.50% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than two years and not later than three years [member] | 5.95% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than two years and not later than three years [member] | 5.7% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than two years and not later than three years [member] | 5.25% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than two years and not later than three years [member] | 5.75% Notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than three years and not later than four years [member]  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Gross lease liabilities 7
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Gross lease liabilities 7
Later than three years and not later than four years [member] | 7.73% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than three years and not later than four years [member] | 7.70% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than three years and not later than four years [member] | 7.37% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than three years and not later than four years [member] | 8.05% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than three years and not later than four years [member] | 6.38% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than three years and not later than four years [member] | 5.80% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than three years and not later than four years [member] | 5.80% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than three years and not later than four years [member] | 6.45% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than three years and not later than four years [member] | 6.35% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than three years and not later than four years [member] | 7.50% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than three years and not later than four years [member] | 5.95% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than three years and not later than four years [member] | 5.7% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than three years and not later than four years [member] | 5.25% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than three years and not later than four years [member] | 5.75% Notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than four years and not later than five years [member]  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Gross lease liabilities 5
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Gross lease liabilities 5
Later than four years and not later than five years [member] | 7.73% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than four years and not later than five years [member] | 7.70% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than four years and not later than five years [member] | 7.37% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than four years and not later than five years [member] | 8.05% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than four years and not later than five years [member] | 6.38% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than four years and not later than five years [member] | 5.80% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than four years and not later than five years [member] | 5.80% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than four years and not later than five years [member] | 6.45% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than four years and not later than five years [member] | 6.35% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than four years and not later than five years [member] | 7.50% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than four years and not later than five years [member] | 5.95% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than four years and not later than five years [member] | 5.7% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than four years and not later than five years [member] | 5.25% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than four years and not later than five years [member] | 5.75% Notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than five years [member]  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 4,632
Gross lease liabilities 12
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 4,632
Gross lease liabilities 12
Later than five years [member] | 7.73% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than five years [member] | 7.70% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than five years [member] | 7.37% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than five years [member] | 8.05% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 0
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 0
Later than five years [member] | 6.38% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 200
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 200
Later than five years [member] | 5.80% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 200
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 200
Later than five years [member] | 5.80% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 200
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 200
Later than five years [member] | 6.45% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 300
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 300
Later than five years [member] | 6.35% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 600
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 600
Later than five years [member] | 7.50% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 250
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 250
Later than five years [member] | 5.95% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 807
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 807
Later than five years [member] | 5.7% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 850
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 850
Later than five years [member] | 5.25% notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 375
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings 375
Later than five years [member] | 5.75% Notes  
Scheduled debt repayments [abstract]  
Total undiscounted cash flows of borrowings 850
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Total undiscounted cash flows of borrowings $ 850