101 - Document - Document and Entity Information link:calculationLink link:presentationLink link:definitionLink 103 - Statement - CONSOLIDATED STATEMENT OF INCOME link:calculationLink link:presentationLink link:definitionLink 104 - Statement - CONSOLIDATED STATEMENT OF INCOME (Parenthetical) link:calculationLink link:presentationLink link:definitionLink 105 - Statement - CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME link:calculationLink link:presentationLink link:definitionLink 106 - Statement - CONSOLIDATED BALANCE SHEET link:calculationLink link:presentationLink link:definitionLink 107 - Statement - CONSOLIDATED BALANCE SHEET (Parenthetical) link:calculationLink link:presentationLink link:definitionLink 108 - Statement - CONSOLIDATED STATEMENT OF CASH FLOWS link:calculationLink link:presentationLink link:definitionLink 109 - Statement - CONSOLIDATED STATEMENT OF CASH FLOWS (Parenthetical) link:calculationLink link:presentationLink link:definitionLink 110 - Disclosure - Basis of financial statement preparation link:calculationLink link:presentationLink link:definitionLink 111 - Disclosure - Business Segments link:calculationLink link:presentationLink link:definitionLink 112 - Disclosure - Investment and other income link:calculationLink link:presentationLink link:definitionLink 113 - Disclosure - Employee retirement benefits link:calculationLink link:presentationLink link:definitionLink 114 - Disclosure - Financing costs link:calculationLink link:presentationLink link:definitionLink 115 - Disclosure - Long-term debt link:calculationLink link:presentationLink link:definitionLink 116 - Disclosure - Other long-term obligations link:calculationLink link:presentationLink link:definitionLink 117 - Disclosure - Net income per share link:calculationLink link:presentationLink link:definitionLink 118 - Disclosure - Other comprehensive income information link:calculationLink link:presentationLink link:definitionLink 119 - Disclosure - Business Segments (Tables) link:calculationLink link:presentationLink link:definitionLink 120 - Disclosure - Investment and other income (Tables) link:calculationLink link:presentationLink link:definitionLink 121 - Disclosure - Employee retirement benefits (Tables) link:calculationLink link:presentationLink link:definitionLink 122 - Disclosure - Financing costs (Tables) link:calculationLink link:presentationLink link:definitionLink 123 - Disclosure - Long-term debt (Tables) link:calculationLink link:presentationLink link:definitionLink 124 - Disclosure - Other long-term obligations (Tables) link:calculationLink link:presentationLink link:definitionLink 125 - Disclosure - Net income per share (Tables) link:calculationLink link:presentationLink link:definitionLink 126 - Disclosure - Other comprehensive income information (Tables) link:calculationLink link:presentationLink link:definitionLink 127 - Disclosure - Business Segments (Detail) link:calculationLink link:presentationLink link:definitionLink 128 - Disclosure - Gains And Losses On Asset Sales (Detail) link:calculationLink link:presentationLink link:definitionLink 129 - Disclosure - Schedule Of Components Of Net Benefit Cost (Detail) link:calculationLink link:presentationLink link:definitionLink 130 - Disclosure - Schedule Of Financing Costs (Detail) link:calculationLink link:presentationLink link:definitionLink 131 - Disclosure - Long Term Debt (Detail) link:calculationLink link:presentationLink link:definitionLink 132 - Disclosure - Long-term debt - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 133 - Disclosure - Other Long-Term Obligations (Detail) link:calculationLink link:presentationLink link:definitionLink 134 - Disclosure - Other Long-Term Obligations (Parenthetical) (Detail) link:calculationLink link:presentationLink link:definitionLink 135 - Disclosure - Calculation of Net Income Per Share (Detail) link:calculationLink link:presentationLink link:definitionLink 136 - Disclosure - Total Comprehensive Income (Detail) link:calculationLink link:presentationLink link:definitionLink 137 - Disclosure - Income Tax Expense/(Credit) For Components Of Comprehensive Income (Detail) link:calculationLink link:presentationLink link:definitionLink