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Note 11: Employee Benefit Plans (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2010
Dec. 31, 2009
Jun. 30, 2009
Notes to Consolidated Financial Statements [Abstract]          
Contributions to Defined Contribution Plans $ 218,000,000 $ 200,000,000   $ 192,000,000  
Employee Stock Ownership Plan ESOP Number Of Allocated Shares 33.6        
Employee Stock Ownership Plan ESOP Number Of Suspense Shares 18.8        
Employee Stock Ownership Plan ESOP Deferred Shares Fair Value 1,400,000,000        
Defined Benefit Plan Amounts Recognized In Balance Sheet Abstract          
Pension And Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent (5,007,000,000) (3,592,000,000)      
Defined Benefit Plan Estimated Future Benefit Payments Abstract          
Domestic Defined Benefit Plan Cash Contributions By Employer 156,000,000 1,001,000,000      
Domestic Defined Benefit Plan Stock Contributions By Employer 450,000,000 250,000,000   0  
Foreign Defined Benefit Plan Cash Contributions By Employer 395,000,000 298,000,000      
Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Abstract          
Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Projected Benefit Obligation 24,091,000,000 21,556,000,000      
Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation 23,198,000,000 20,562,000,000      
Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets 19,949,000,000 18,885,000,000      
Defined Benefit Plan Accumulated Benefit Obligation 26,000,000,000 23,200,000,000      
Percentage Of Growth Seeking Assets In Company's Overall Investment Strategy 65.00%        
Percentage Of Income Generating Assets In Company's Overall Investment Strategy 35.00%        
Percentage Of Enhanced Equity Assets In Global Equity Portfolio 9.00%        
Pecentage Of Interest Rate Sensitivity Of Pension Plan Liabilities Fixed Income Portfolio Designed To Hedge 40.00%        
Defined Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year 100,000,000        
Defined Benefit Plan Assumed Health Care Cost Trend Rates Abstract          
Defined Benefit Plan Health Care Cost Trend Rate Assumed For Next Fiscal Year 8.50% 9.00%      
Defined Benefit Plan Ultimate Health Care Cost Trend Rate 5.00% 5.00%      
Defined Benefit Plan Year That Rate Reaches Ultimate Trend Rate 2019 2019      
Defined Benefit Plan Effect Of One Percentage Point Change In Assumed Health Care Cost Trend Rates Abstract          
Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components 2,000,000        
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components 1 (2,000,000)        
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation 47,000,000        
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation 1 (40,000,000)        
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized 119,000,000        
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant 56,000,000        
Expected Range Of Shares Awarded Annually Under Long Term Incentive Plan shares awarded on an annual basis will range from 1% to 1.5% of shares outstanding        
Allocated Share Based Compensation Expense 229,000,000 154,000,000   153,000,000  
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 75,000,000 47,000,000   49,000,000  
Employee Service Share Based Compensation Cash Received From Exercise Of Stock Options 226,000,000 386,000,000   342,000,000  
Employee Service Share Based Compensation Tax Benefit Realized From Exercise Of Stock Options 101,000,000 139,000,000   95,000,000  
Employee Service Share Based Compensation Tax Benefit Realized From Vesting Of Performance Share Units 19,000,000 20,000,000   33,000,000  
Employee Service Share Based Compensation Cash Flow Tax Benefit Reported 81,000,000 94,000,000   50,000,000  
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized 152,000,000        
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition 1.9        
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology Abstract          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum 26.00% 24.00%   30.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum 32.00% 28.00%   42.00%  
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Volatility Rate 26.00% 25.00%   30.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term, Minimum 7.5 7.4   7.4  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term, Maximum 8.0 7.9   7.9  
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate 2.40% 2.70%   2.10%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum 0.10% 0.10%   0.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum 3.50% 4.00%   2.50%  
Multiemployer Plans [Line Items]          
Multiemployer Plans General Nature We contribute to various domestic and foreign multiemployer defined benefit pension plans. The risks of participating in these multiemployer plans are different from single-employer plans in that assets contributed are pooled and may be used to provide benefits to employees of other participating employers. If a participating employer stops contributing to the plan, the unfunded obligations of the plan may be borne by the remaining participating employers. Lastly, if we choose to stop participating in some of our multiemployer plans, we may be required to pay those plans a withdrawal liability based on the underfunded status of the plan.        
Multiemployer Plans Period Contributions 94,000,000 90,000,000   97,000,000  
Multiemployer Plans Period Contributions Significance Of Contributions     true   true
Multiemployer Plans Period Contributions Other Than Pensions 10,000,000 10,000,000   11,000,000  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Vested In Period Total Fair Value 170,000,000 172,000,000   235,000,000  
Stock Options [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number, Beginning Balance 27,337,000        
Share Based Compensation Arrangement By Share Based Payment Award Options, Grants In Period 320,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (6,551,000)        
Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period (77,000)        
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number, Ending Balance 21,029,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Beginning of Period $ 44.82        
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price $ 78.99        
Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price $ 37.36        
Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price $ 53.78        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, End of Period $ 47.63        
Stock Appreciation Rights (SARs) [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number, Beginning Balance 31,220,000        
Share Based Compensation Arrangement By Share Based Payment Award Options, Grants In Period 4,916,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (1,249,000)        
Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period (849,000)        
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number, Ending Balance 34,038,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Beginning of Period $ 64.72        
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price $ 79.09        
Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price $ 64.96        
Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price $ 68.30        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, End of Period $ 66.70        
Performance Share Units [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number, Beginning Balance 3,024,000        
Share Based Compensation Arrangement By Share Based Payment Award Options, Grants In Period 946,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (746,000)        
Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period (262,000)        
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number, Ending Balance 2,962,000 3,024,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Beginning of Period $ 65.96        
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price $ 78.99        
Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price $ 75.21        
Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price $ 71.40        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, End of Period $ 67.31 $ 65.96      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 87.65 $ 78.73   $ 61.56  
Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value 59,000,000 62,000,000   100,000,000  
Other Incentives [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number, Beginning Balance 807,000        
Share Based Compensation Arrangement By Share Based Payment Award Options, Grants In Period 455,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (116,000)        
Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period (37,000)        
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number, Ending Balance 1,109,000        
Stock Options And Stock Appreciation Rights SARS [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 20.26 $ 17.86   $ 16.01  
Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value 336,000,000 446,000,000   296,000,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 54,779,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price $ 59.01        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value 771,000,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term 5.0        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 37,362,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 55.03        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value 675,000,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 3.6        
Performance Share Units And Restricted Stock [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 3,065,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price $ 0        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value 224,000,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term 1.3        
National Elevator Industry Plan [Member]
         
Multiemployer Plans [Line Items]          
Entity Tax Identification Number 232694291        
Multiemployer Plans Certified Zone Status Green Green      
Multiemployer Plans Funding Improvement Plan And Rehabilitation Plan No        
Multiemployer Plans Period Contributions 56,000,000 55,000,000   60,000,000  
Multiemployer Plans Surcharge No        
Multiemployer Plans Collective Bargaining Arrangement Expiration Date July 8, 2012        
Other Funds [Member]
         
Multiemployer Plans [Line Items]          
Multiemployer Plans Period Contributions 38,000,000 35,000,000   37,000,000  
Global Equities [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 5,214,000,000 5,340,000,000      
Global Equity Commingled Funds [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 2,981,000,000 [1] 3,200,000,000 [1]      
Enhanced Global Equities [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 1,873,000,000 [2] 1,964,000,000 [2]      
Private Equity Funds [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 1,159,000,000 [3] 1,134,000,000 [3]      
US Treasury And Government [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 2,763,000,000 1,840,000,000      
Corporate Debt Securities [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 5,277,000,000 5,445,000,000      
Asset Backed Securities [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 67,000,000 [4] 76,000,000 [4]      
Real Estate [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 1,380,000,000 [5] 970,000,000 [5]      
Other Pension Plan Assets [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 1,869,000,000 [6] 1,517,000,000 [6]      
Cash And Cash Equivalents [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 359,000,000 [7] 293,000,000 [7]      
Other Assets And Liabilities [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 600,000,000 [8] 605,000,000 [8]      
Pension Plan Assets Leveled [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 22,942,000,000 21,779,000,000      
Quoted price in active markets (Level 1) [Member] | Global Equities [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 5,210,000,000 5,332,000,000      
Quoted price in active markets (Level 1) [Member] | Global Equity Commingled Funds [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 0 [1] 0 [1]      
Quoted price in active markets (Level 1) [Member] | Enhanced Global Equities [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 44,000,000 [2] 57,000,000 [2]      
Quoted price in active markets (Level 1) [Member] | Private Equity Funds [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 0 [3] 0 [3]      
Quoted price in active markets (Level 1) [Member] | US Treasury And Government [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 1,564,000,000 691,000,000      
Quoted price in active markets (Level 1) [Member] | Corporate Debt Securities [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 0 21,000,000      
Quoted price in active markets (Level 1) [Member] | Asset Backed Securities [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 0 [4] 0 [4]      
Quoted price in active markets (Level 1) [Member] | Real Estate [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 0 [5] 0 [5]      
Quoted price in active markets (Level 1) [Member] | Other Pension Plan Assets [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 0 [6] 0 [6]      
Quoted price in active markets (Level 1) [Member] | Cash And Cash Equivalents [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 0 [7] 0 [7]      
Quoted price in active markets (Level 1) [Member] | Pension Plan Assets Leveled [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 6,818,000,000 6,101,000,000      
Significant other observable inputs (Level 2) [Member] | Global Equities [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 4,000,000 7,000,000      
Significant other observable inputs (Level 2) [Member] | Global Equity Commingled Funds [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 2,981,000,000 [1] 3,200,000,000 [1]      
Significant other observable inputs (Level 2) [Member] | Enhanced Global Equities [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 1,590,000,000 [2] 1,662,000,000 [2]      
Significant other observable inputs (Level 2) [Member] | Private Equity Funds [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 0 [3] 0 [3]      
Significant other observable inputs (Level 2) [Member] | US Treasury And Government [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 1,199,000,000 1,149,000,000      
Significant other observable inputs (Level 2) [Member] | Corporate Debt Securities [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 5,167,000,000 5,424,000,000      
Significant other observable inputs (Level 2) [Member] | Asset Backed Securities [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 67,000,000 [4] 76,000,000 [4]      
Significant other observable inputs (Level 2) [Member] | Real Estate [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 16,000,000 [5] 26,000,000 [5]      
Significant other observable inputs (Level 2) [Member] | Other Pension Plan Assets [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 1,869,000,000 [6] 1,517,000,000 [6]      
Significant other observable inputs (Level 2) [Member] | Cash And Cash Equivalents [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 359,000,000 [7] 293,000,000 [7]      
Significant other observable inputs (Level 2) [Member] | Pension Plan Assets Leveled [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 13,252,000,000 13,354,000,000      
Unobservable inputs (Level 3) [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance 2,324,000,000 1,771,000,000      
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 2,872,000,000 2,324,000,000      
Defined Benefit Plan Actual Return On Plan Assets Sold During Period 101,000,000 151,000,000      
Defined Benefit Plan Actual Return On Plan Assets Still Held 159,000,000 123,000,000      
Defined Benefit Plan Purchases Sales And Settlements 288,000,000 257,000,000      
Defined Benefit Plan Transfers Between Measurement Levels   22,000,000      
Unobservable inputs (Level 3) [Member] | Global Equities [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance 1,000,000 0      
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 0 1,000,000      
Defined Benefit Plan Actual Return On Plan Assets Sold During Period 0        
Defined Benefit Plan Actual Return On Plan Assets Still Held 0 0      
Defined Benefit Plan Purchases Sales And Settlements (1,000,000) 1,000,000      
Defined Benefit Plan Transfers Between Measurement Levels   0      
Unobservable inputs (Level 3) [Member] | Global Equity Commingled Funds [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 0 [1] 0 [1]      
Unobservable inputs (Level 3) [Member] | Enhanced Global Equities [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance 245,000,000 [2] 11,000,000      
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 239,000,000 [2] 245,000,000 [2]      
Defined Benefit Plan Actual Return On Plan Assets Sold During Period (1,000,000) 0      
Defined Benefit Plan Actual Return On Plan Assets Still Held (1,000,000) 9,000,000      
Defined Benefit Plan Purchases Sales And Settlements (4,000,000) 225,000,000      
Defined Benefit Plan Transfers Between Measurement Levels   0      
Unobservable inputs (Level 3) [Member] | Private Equity Funds [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance 1,134,000,000 [3] 1,045,000,000      
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 1,159,000,000 [3] 1,134,000,000 [3]      
Defined Benefit Plan Actual Return On Plan Assets Sold During Period 108,000,000 157,000,000      
Defined Benefit Plan Actual Return On Plan Assets Still Held 17,000,000 51,000,000      
Defined Benefit Plan Purchases Sales And Settlements (100,000,000) (119,000,000)      
Defined Benefit Plan Transfers Between Measurement Levels   0      
Unobservable inputs (Level 3) [Member] | US Treasury And Government [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 0 0      
Unobservable inputs (Level 3) [Member] | Corporate Debt Securities [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance 0 0      
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 110,000,000 0      
Defined Benefit Plan Actual Return On Plan Assets Sold During Period 0 0      
Defined Benefit Plan Actual Return On Plan Assets Still Held 6,000,000 0      
Defined Benefit Plan Purchases Sales And Settlements 104,000,000 0      
Defined Benefit Plan Transfers Between Measurement Levels   0      
Unobservable inputs (Level 3) [Member] | Asset Backed Securities [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 0 [4] 0 [4]      
Unobservable inputs (Level 3) [Member] | Real Estate [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance 944,000,000 [5] 715,000,000      
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 1,364,000,000 [5] 944,000,000 [5]      
Defined Benefit Plan Actual Return On Plan Assets Sold During Period (6,000,000) (6,000,000)      
Defined Benefit Plan Actual Return On Plan Assets Still Held 137,000,000 63,000,000      
Defined Benefit Plan Purchases Sales And Settlements 289,000,000 150,000,000      
Defined Benefit Plan Transfers Between Measurement Levels   22,000,000      
Unobservable inputs (Level 3) [Member] | Other Pension Plan Assets [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 0 [6] 0 [6]      
Unobservable inputs (Level 3) [Member] | Cash And Cash Equivalents [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 0 [7] 0 [7]      
Unobservable inputs (Level 3) [Member] | Pension Plan Assets Leveled [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 2,872,000,000 2,324,000,000      
Pension Plans, Defined Benefit [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Benefit Obligation, Beginning Balance 24,445,000,000 22,271,000,000      
Defined Benefit Plan, Service Cost 444,000,000 396,000,000   429,000,000  
Defined Benefit Plan, Interest Cost 1,298,000,000 1,287,000,000   1,285,000,000  
Defined Benefit Plan, Actuarial Net (Gains) Losses 2,185,000,000 1,625,000,000      
Defined Benefit Plan, Benefits Paid (1,233,000,000) (1,216,000,000)      
Defined Benefit Plan, Net Settlements Curtailments Benefit Obligation 1,000,000 (37,000,000)      
Defined Benefit Plan Plan Amendments 21,000,000 121,000,000      
Defined Benefit Plan Benefit Obligation Other FX Aquisition Disposition Medicare RX Receivable 6,000,000 (2,000,000)      
Defined Benefit Plan, Benefit Obligation, Ending Balance 27,167,000,000 24,445,000,000   22,271,000,000  
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance 22,384,000,000 19,377,000,000      
Defined Benefit Plan Actual Return On Plan Assets 1,320,000,000 2,635,000,000      
Contributions to Defined Benefit Plans 1,060,000,000 1,621,000,000      
Defined Benefit Plan, Plan Assets, Benefits Paid (1,233,000,000) (1,216,000,000)      
Defined Benefit Plan Fair Value Of Plan Assets Other FX Aquisitions Dispositions 11,000,000 (33,000,000)      
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 23,542,000,000 22,384,000,000   19,377,000,000  
Defined Benefit Plan Funded Status Of Plan (3,625,000,000) (2,061,000,000)      
Percentage Of Projected Benefit Obligation Comprised Of Domestic Plan Benefits 76.00%        
Projected Benefit Obligation Reduction Due To Plan Change       623,000,000  
Percentage Of Projected Benefit Obligation Comprised Of Foreign Plan Benefits 23.00%        
Defined Benefit Plan, Expected Return on Plan Assets (1,834,000,000) (1,735,000,000)   (1,634,000,000)  
Defined Benefit Plan Amortization Of Prior Service Cost Credit (12,000,000) (18,000,000)   56,000,000  
Defined Benefit Plan Amortization Of Transition Obligations Assets 1,000,000 1,000,000   1,000,000  
Defined Benefit Plan Amortization Of Gains Losses 462,000,000 285,000,000   226,000,000  
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments 16,000,000 2,000,000   102,000,000  
Defined Benefit Plan, Net Periodic Benefit Cost 375,000,000 218,000,000   465,000,000  
Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax 2,700,000,000        
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax (462,000,000)        
Other Comprehensive Income Defined Benefit Plan Net Prior Service Cost Credit Arising During Period Before Tax 21,000,000        
Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Credit Recognized In Net Periodic Benefit Cost Before Tax 12,000,000        
Other Comprehensive Income Reclassification Of Defined Benefit Plan Net Transition Asset Obligation Recognized In Net Periodic Benefit Cost Before Tax (1,000,000)        
Other Comprehensive Income Defined Benefit Plans Other (1,000,000)        
Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Period Increase Decrease 2,269,000,000        
Net Recognized In Net Periodic Benefit Cost And Other Comprehensive Income Loss 2,644,000,000        
Defined Benefit Plan Percentage Of Equity Securities Issued By Employer And Related Parties Included In Plan Assets 4.00% 3.00%      
Defined Benefit Plan Amounts Recognized In Balance Sheet Abstract          
Defined Benefit Plan Assets For Plan Benefits Noncurrent 552,000,000 637,000,000      
Pension And Other Postretirement Defined Benefit Plans Current Liabilities (64,000,000) (58,000,000)      
Pension And Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent (4,113,000,000) (2,640,000,000)      
Defined Benefit Plan Amounts Recognized In Balance Sheet (3,625,000,000) (2,061,000,000)      
Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax Abstract          
Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Before Tax 9,436,000,000 7,223,000,000      
Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Net Prior Service Cost Credit Before Tax (152,000,000) (184,000,000)      
Defined Benefit Plan Accumulated Other Comprehensive Income Net Transition Assets Obligations Before Tax 6,000,000 6,000,000      
Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax 9,290,000,000 7,045,000,000      
Defined Benefit Plan Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Loss In Next Fiscal Year Abstract          
Defined Benefit Plan Amortization Of Net Gains Losses 722,000,000        
Defined Benefit Plan Amortization Of Net Prior Service Cost Credit (12,000,000)        
Defined Benefit Plan Amortization Of Net Transition Asset Obligation 1,000,000        
Defined Benefit Plan Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Loss In Next Fiscal Year 711,000,000        
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Benefit Obligation Abstract          
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate 4.70% 5.40%      
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase 4.30% 4.40%      
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Net Periodic Benefit Cost Abstract          
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate 5.40% 5.90%   6.10%  
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase 4.40% 4.40%   4.40%  
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets 7.90% 8.00%   8.20%  
Defined Benefit Plan Estimated Future Benefit Payments Abstract          
Defined Benefit Plan Expected Future Benefit Payments In Year One 1,356,000,000        
Defined Benefit Plan Expected Future Benefit Payments In Year Two 1,378,000,000        
Defined Benefit Plan Expected Future Benefit Payments In Year Three 1,433,000,000        
Defined Benefit Plan Expected Future Benefit Payments In Year Four 1,493,000,000        
Defined Benefit Plan Expected Future Benefit Payments In Year Five 1,556,000,000        
Defined Benefit Plan Expected Future Benefit Payments In Five Fiscal Years Thereafter 8,788,000,000        
Other Postretirement Benefit Plans, Defined Benefit [Member]
         
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Benefit Obligation, Beginning Balance 832,000,000 876,000,000      
Defined Benefit Plan, Service Cost 3,000,000 2,000,000   2,000,000  
Defined Benefit Plan, Interest Cost 39,000,000 46,000,000   50,000,000  
Defined Benefit Plan, Actuarial Net (Gains) Losses (7,000,000) (29,000,000)      
Defined Benefit Plan, Benefits Paid (104,000,000) (105,000,000)      
Defined Benefit Plan Benefit Obligation Other FX Aquisition Disposition Medicare RX Receivable 21,000,000 42,000,000      
Defined Benefit Plan, Benefit Obligation, Ending Balance 784,000,000 832,000,000   876,000,000  
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance 10,000,000 11,000,000      
Defined Benefit Plan Actual Return On Plan Assets 2,000,000 (1,000,000)      
Contributions to Defined Benefit Plans 76,000,000 76,000,000      
Defined Benefit Plan Fair Value Of Plan Assets Other FX Aquisitions Dispositions 16,000,000 29,000,000      
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 0 10,000,000   11,000,000  
Defined Benefit Plan Funded Status Of Plan (784,000,000) (822,000,000)      
Percentage Of Projected Benefit Obligation Comprised Of Domestic Plan Benefits 84.00%        
Defined Benefit Plan, Expected Return on Plan Assets (1,000,000) (1,000,000)   (1,000,000)  
Defined Benefit Plan Amortization Of Prior Service Cost Credit (2,000,000) (2,000,000)   (2,000,000)  
Defined Benefit Plan Amortization Of Gains Losses (8,000,000) (1,000,000)   (3,000,000)  
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments (8,000,000) 0   0  
Defined Benefit Plan, Net Periodic Benefit Cost 23,000,000 44,000,000   46,000,000  
Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax (8,000,000)        
Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Credit Recognized In Net Periodic Benefit Cost Before Tax 2,000,000        
Other Comprehensive Income Defined Benefit Plans Other 10,000,000        
Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Period Increase Decrease 12,000,000        
Net Recognized In Net Periodic Benefit Cost And Other Comprehensive Income Loss 35,000,000        
Defined Benefit Plan Amounts Recognized In Balance Sheet Abstract          
Pension And Other Postretirement Defined Benefit Plans Current Liabilities (74,000,000) (66,000,000)      
Pension And Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent (710,000,000) (756,000,000)      
Defined Benefit Plan Amounts Recognized In Balance Sheet (784,000,000) (822,000,000)      
Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax Abstract          
Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Before Tax (120,000,000) (130,000,000)      
Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Net Prior Service Cost Credit Before Tax 2,000,000 1,000,000      
Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax (118,000,000) (129,000,000)      
Defined Benefit Plan Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Loss In Next Fiscal Year Abstract          
Defined Benefit Plan Amortization Of Net Gains Losses (6,000,000)        
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Benefit Obligation Abstract          
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate 4.30% 4.90%      
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Net Periodic Benefit Cost Abstract          
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate 4.90% 5.50%   6.00%  
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets 5.00% 5.00%   5.80%  
Defined Benefit Plan Estimated Future Benefit Payments Abstract          
Defined Benefit Plan Expected Future Benefit Payments In Year One 79,000,000        
Defined Benefit Plan Expected Future Benefit Payments In Year Two 74,000,000        
Defined Benefit Plan Expected Future Benefit Payments In Year Three 72,000,000        
Defined Benefit Plan Expected Future Benefit Payments In Year Four 69,000,000        
Defined Benefit Plan Expected Future Benefit Payments In Year Five 63,000,000        
Defined Benefit Plan Expected Future Benefit Payments In Five Fiscal Years Thereafter $ 265,000,000        
[1] Represents commingled funds that invest primarily in common stocks.
[2] Represents enhanced equity separate account and commingled fund portfolios. A portion of the portfolio may include long-shortmarket neutral and relative value strategies that invest in publicly traded, equity and fixed income securities, as well as derivatives of equityand fixed income securities and foreign currency.
[3] Represents limited partner investments with general partners that primarily invest in debt and equity.
[4] Represents mortgage and asset-backed securities.
[5] Represents investments in real estate including commingled funds and directly held properties.
[6] Represents insurance contracts and global balanced risk commingled funds consisting mainly of equity, bonds and some commodities.
[7] Represents short-term commercial paper, bonds and other cash or cash-like instruments.
[8] Represents trust receivables and payables that are not leveled.