v3.3.1.900
Pension And Other Postretirement Benefits (Fair Value Of Benefit Plan Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Pension Benefits - U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Insurance contracts at contract value $ 15 $ 11  
Fair value of plan assets 10,985 12,915 $ 11,190
Pension Benefits - U.S. [Member] | U.S. Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,992 2,331  
Pension Benefits - U.S. [Member] | Non-U.S. Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,775 2,144  
Pension Benefits - U.S. [Member] | Private Equity [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 595 562  
Pension Benefits - U.S. [Member] | Corporate Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4,161 4,841  
Pension Benefits - U.S. [Member] | Government Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,394 2,890  
Pension Benefits - U.S. [Member] | Asset-Backed Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3 5  
Pension Benefits - U.S. [Member] | Cash [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 50 131  
Pension Benefits - U.S. [Member] | Total At Fair Value [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 10,970 12,904  
Pension Benefits - U.S. [Member] | Fair Value Inputs Level 2 [Member] | U.S. Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] 1,992 2,331  
Pension Benefits - U.S. [Member] | Fair Value Inputs Level 2 [Member] | Non-U.S. Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] 1,775 2,144  
Pension Benefits - U.S. [Member] | Fair Value Inputs Level 2 [Member] | Corporate Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 4,161 4,841  
Pension Benefits - U.S. [Member] | Fair Value Inputs Level 2 [Member] | Government Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 2,394 2,890  
Pension Benefits - U.S. [Member] | Fair Value Inputs Level 2 [Member] | Asset-Backed Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 3 5  
Pension Benefits - U.S. [Member] | Fair Value Inputs Level 2 [Member] | Cash [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3] 50 131  
Pension Benefits - U.S. [Member] | Fair Value Inputs Level 2 [Member] | Total At Fair Value [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 10,375 12,342  
Pension Benefits - U.S. [Member] | Fair Value Inputs Level 3 [Member] | Private Equity [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [4] 595 562  
Pension Benefits - U.S. [Member] | Fair Value Inputs Level 3 [Member] | Total At Fair Value [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 595 562  
Pension Benefits - Non-U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Insurance contracts at contract value 26 27  
Fair value of plan assets 18,417 20,095 $ 19,283
Pension Benefits - Non-U.S. [Member] | U.S. Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,179 3,284  
Pension Benefits - Non-U.S. [Member] | Non-U.S. Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,608 4,005  
Pension Benefits - Non-U.S. [Member] | Private Equity [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 581 535  
Pension Benefits - Non-U.S. [Member] | Corporate Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,561 2,686  
Pension Benefits - Non-U.S. [Member] | Government Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8,368 9,299  
Pension Benefits - Non-U.S. [Member] | Asset-Backed Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 71 146  
Pension Benefits - Non-U.S. [Member] | Real Estate Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   57  
Pension Benefits - Non-U.S. [Member] | Cash [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 23 56  
Pension Benefits - Non-U.S. [Member] | Total At Fair Value [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 18,391 20,068  
Pension Benefits - Non-U.S. [Member] | Fair Value Inputs Level 1 [Member] | Non-U.S. Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [5] 179 229  
Pension Benefits - Non-U.S. [Member] | Fair Value Inputs Level 1 [Member] | Government Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [6] 243 249  
Pension Benefits - Non-U.S. [Member] | Fair Value Inputs Level 1 [Member] | Cash [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 11 25  
Pension Benefits - Non-U.S. [Member] | Fair Value Inputs Level 1 [Member] | Total At Fair Value [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 433 503  
Pension Benefits - Non-U.S. [Member] | Fair Value Inputs Level 2 [Member] | U.S. Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] 3,179 3,284  
Pension Benefits - Non-U.S. [Member] | Fair Value Inputs Level 2 [Member] | Non-U.S. Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] 3,429 3,776  
Pension Benefits - Non-U.S. [Member] | Fair Value Inputs Level 2 [Member] | Corporate Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 2,561 2,686  
Pension Benefits - Non-U.S. [Member] | Fair Value Inputs Level 2 [Member] | Government Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 8,125 9,050  
Pension Benefits - Non-U.S. [Member] | Fair Value Inputs Level 2 [Member] | Asset-Backed Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 71 146  
Pension Benefits - Non-U.S. [Member] | Fair Value Inputs Level 2 [Member] | Cash [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [7] 12 31  
Pension Benefits - Non-U.S. [Member] | Fair Value Inputs Level 2 [Member] | Total At Fair Value [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 17,377 18,973  
Pension Benefits - Non-U.S. [Member] | Fair Value Inputs Level 3 [Member] | Private Equity [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [4] 581 535  
Pension Benefits - Non-U.S. [Member] | Fair Value Inputs Level 3 [Member] | Real Estate Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [8]   57  
Pension Benefits - Non-U.S. [Member] | Fair Value Inputs Level 3 [Member] | Total At Fair Value [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 581 $ 592  
[1] For U.S. and non-U.S. equity securities held in the form of fund units that are redeemable at the measurement date, the unit value is treated as a Level 2 input. The fair value of the securities owned by the funds is based on observable quoted prices on active exchanges, which are Level 1 inputs.
[2] For corporate, government and asset-backed debt securities, fair value is based on observable inputs of comparable market transactions.
[3] For cash balances held in the form of short-term fund units that are redeemable at the measurement date, the fair value is treated as a Level 2 input.
[4] For private equity, fair value is generally established by using revenue or earnings multiples or other relevant market data including Initial Public Offerings.
[5] For non-U.S. equity securities held in separate accounts, fair value is based on observable quoted prices on active exchanges.
[6] For corporate and government debt securities that are traded on active exchanges, fair value is based on observable quoted prices.
[7] For cash balances that are subject to withdrawal penalties or other adjustments, the fair value is treated as a Level 2 input.
[8] For real estate funds, fair value is based on appraised values developed using comparable market transactions.