Aggregate Change in Actuarial Present Value of Accumulated Benefit Under Pension Plans [Member] Aggregate Service Costs and Prior Service Costs for Pension Plans [Member] Change In Fair Value of Awards Granted in Prior Year(S) That Remain Unvested in Covered Year [Member] Change In Fair Value of Awards Granted in Prior Year(S) That Vested In the Covered Year [Member] Change In Pension Value and Equity Award Value [Member] Adjustments For Equity Awards Failed To Meet Performance Conditions [Member] Change In Fair Value As Of Vesting Date Of Current Year Awards Vested During Current Year [Member] Change In Fair Value As Of Vesting Date Of Prior Year Awards Vested During Current Year [Member] Change In Fair Value As Of Vesting Date Of Awards Vested During Current Year [Member] Change In Fair Value Of Outstanding And Unvested Awards Granted In Prior Fiscal Years [Member] Dividends Or Other Earnings Paid On Equity Awards Not Otherwise Reflected In Fair Value [Member] Total Equity Awards Adjustments [Member] Year-end Fair Value Of Awards Granted In The Current Fiscal Year [Member] Equity Awards Value In Summary Compensation Table (Grant Date Value) [Member] Fair Value of Awards Forfeited During the Covered Year [Member] Gallagher [Member] Grant-Date Fair Value of Awards Reported in the SCT [Member] Total Net Adjustments For Equity Awards [Member] Total Net Adjustments For Pension [Member] Total Pension Adjustments [Member] Pension Adjustments Prior Service Cost [Member] Pension Adjustments Service Cost [Member] Pension Value And Equity Awards Value In Compensation Table For The Applicable Year [Member] Pension Adjustments Pension Value In Summary Compensation Table [Member] Vesting-Date Fair Value of Awards Granted and Vested in The Covered Year [Member] William J. Amelio [Member] Year-End Fair Value of Awards Granted but Remain Unvested in The Covered Year [Member]