Share Capital And Capital Reserves [Member] Share Capital And Capital Reserves Fixed Assets Fixed Assets Fixed Assets Transactions Involving NonControlling Interests Net Of Tax Transactions Involving NonControlling Interests Net Of Tax American Depositary Share [Member] American Depositary Share Share of equity accounted entities changes in equity net of tax Share Of Equity Accounted Entities Changes In Equity Net Of Tax Issue of perpetual hybrid bonds Issue of perpetual hybrid bonds Hybrid Bonds Relating To NonControlling Interests [Member] Hybrid Bonds Relating To NonControlling Interests Payments On Perpetual Hybrid Bonds Payments On Perpetual Hybrid Bonds Cash flows from (used in) operating activities Fair Value Reserves [Member] Fair Value Reserves Adjustments For Net Operating Charge For Pensions And Other Postretirement Benefits Less Contributions And Benefit Payments For Unfunded Plans Adjustments For Net Operating Charge For Pensions And Other Postretirement Benefits Less Contributions And Benefit Payments For Unfunded Plans Other Interest Relating To NonControlling Interests [Member] Other Interest Relating To NonControlling Interests Adjustments For Exploration Expenditure Written Off Adjustments For Exploration Expenditure Written Off Cash flows from (used in) investing activities Increase (decrease) in cash and cash equivalents after effect of exchange rate changes Cash flow hedges transferred to the balance sheet net of tax Cash Flow Hedges Transferred To The Balance Sheet Net Of Tax Assets (liabilities)