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Employee Benefit Plans (Fair values of pension and post retirement plan assets by asset category) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Pension Benefits [Member]
    
Pension plan assets by asset category $ 5,145 [1] $ 5,132 [1]
Excludes net assets related to cash and pending sales and purchases of securities   26
Pension Benefits [Member] | Cash and Cash Equivalents [Member]
    
Pension plan assets by asset category 85 265
Pension Benefits [Member] | US Equity [Member] | Large Cap Value [Member]
    
Pension plan assets by asset category 928 1,134
Pension Benefits [Member] | US Equity [Member] | Equity Securities, Other [Member]
    
Pension plan assets by asset category 556 532
Pension Benefits [Member] | Non US Equity [Member] | Large Cap Value [Member]
    
Pension plan assets by asset category 311 231
Pension Benefits [Member] | Non US Equity [Member] | Equity Securities, Other [Member]
    
Pension plan assets by asset category 271 484
Pension Benefits [Member] | Fixed Income Securities [Member] | Corporate Debt Securities [Member]
    
Pension plan assets by asset category 870 726
Pension Benefits [Member] | Fixed Income Securities [Member] | US Government Debt Securities [Member]
    
Pension plan assets by asset category 696 384
Pension Benefits [Member] | Fixed Income Securities [Member] | US States and Political Subdivisions Debt Securities [Member]
    
Pension plan assets by asset category 79 44
Pension Benefits [Member] | Fixed Income Securities [Member] | Other Debt Securities [Member]
    
Pension plan assets by asset category 48 3
Pension Benefits [Member] | Real Estate [Member] | Real Estate Investment Trust [Member]
    
Pension plan assets by asset category 16 51
Pension Benefits [Member] | Real Estate [Member] | Partnership [Member]
    
Pension plan assets by asset category 304 271
Pension Benefits [Member] | Other Investments [Member] | Private Equity [Member]
    
Pension plan assets by asset category 448 400
Pension Benefits [Member] | Other Investments [Member] | Debt [Member]
    
Pension plan assets by asset category 243 262
Pension Benefits [Member] | Other Investments [Member] | Hedge Funds [Member]
    
Pension plan assets by asset category 290 345
Pension Benefits [Member] | Fair Value, Inputs, Level 1 [Member]
    
Pension plan assets by asset category 1,974 [1] 1,977 [1]
Pension Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
    
Pension plan assets by asset category 1 1
Pension Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | US Equity [Member] | Large Cap Value [Member]
    
Pension plan assets by asset category 805 937
Pension Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | US Equity [Member] | Equity Securities, Other [Member]
    
Pension plan assets by asset category 359 436
Pension Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Non US Equity [Member] | Large Cap Value [Member]
    
Pension plan assets by asset category 253 231
Pension Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Non US Equity [Member] | Equity Securities, Other [Member]
    
Pension plan assets by asset category 190 119
Pension Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities [Member] | Corporate Debt Securities [Member]
    
Pension plan assets by asset category 36 32
Pension Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities [Member] | US Government Debt Securities [Member]
    
Pension plan assets by asset category 304 168
Pension Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities [Member] | US States and Political Subdivisions Debt Securities [Member]
    
Pension plan assets by asset category 2 2
Pension Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities [Member] | Other Debt Securities [Member]
    
Pension plan assets by asset category 8 0
Pension Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Real Estate [Member] | Real Estate Investment Trust [Member]
    
Pension plan assets by asset category 16 51
Pension Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Real Estate [Member] | Partnership [Member]
    
Pension plan assets by asset category 0 0
Pension Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Other Investments [Member] | Private Equity [Member]
    
Pension plan assets by asset category 0 0
Pension Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Other Investments [Member] | Debt [Member]
    
Pension plan assets by asset category 0 0
Pension Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Other Investments [Member] | Hedge Funds [Member]
    
Pension plan assets by asset category 0 0
Pension Benefits [Member] | Fair Value, Inputs, Level 2 [Member]
    
Pension plan assets by asset category 1,886 [1] 1,877 [1]
Pension Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]
    
Pension plan assets by asset category 84 264
Pension Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | US Equity [Member] | Large Cap Value [Member]
    
Pension plan assets by asset category 123 197
Pension Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | US Equity [Member] | Equity Securities, Other [Member]
    
Pension plan assets by asset category 197 96
Pension Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Non US Equity [Member] | Large Cap Value [Member]
    
Pension plan assets by asset category 58 0
Pension Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Non US Equity [Member] | Equity Securities, Other [Member]
    
Pension plan assets by asset category 81 365
Pension Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities [Member] | Corporate Debt Securities [Member]
    
Pension plan assets by asset category 834 694
Pension Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities [Member] | US Government Debt Securities [Member]
    
Pension plan assets by asset category 392 216
Pension Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities [Member] | US States and Political Subdivisions Debt Securities [Member]
    
Pension plan assets by asset category 77 42
Pension Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities [Member] | Other Debt Securities [Member]
    
Pension plan assets by asset category 40 3
Pension Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Real Estate [Member] | Real Estate Investment Trust [Member]
    
Pension plan assets by asset category 0 0
Pension Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Real Estate [Member] | Partnership [Member]
    
Pension plan assets by asset category 0 0
Pension Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Other Investments [Member] | Private Equity [Member]
    
Pension plan assets by asset category 0 0
Pension Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Other Investments [Member] | Debt [Member]
    
Pension plan assets by asset category 0 0
Pension Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Other Investments [Member] | Hedge Funds [Member]
    
Pension plan assets by asset category 0 0
Pension Benefits [Member] | Fair Value, Inputs, Level 3 [Member]
    
Pension plan assets by asset category 1,285 [1] 1,278 [1]
Pension Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member]
    
Pension plan assets by asset category 0 0
Pension Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | US Equity [Member] | Large Cap Value [Member]
    
Pension plan assets by asset category 0 0
Pension Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | US Equity [Member] | Equity Securities, Other [Member]
    
Pension plan assets by asset category 0 0
Pension Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Non US Equity [Member] | Large Cap Value [Member]
    
Pension plan assets by asset category 0 0
Pension Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Non US Equity [Member] | Equity Securities, Other [Member]
    
Pension plan assets by asset category 0 0
Pension Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Income Securities [Member] | Corporate Debt Securities [Member]
    
Pension plan assets by asset category 0 0
Pension Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Income Securities [Member] | US Government Debt Securities [Member]
    
Pension plan assets by asset category 0 0
Pension Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Income Securities [Member] | US States and Political Subdivisions Debt Securities [Member]
    
Pension plan assets by asset category 0 0
Pension Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Income Securities [Member] | Other Debt Securities [Member]
    
Pension plan assets by asset category 0 0
Pension Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Real Estate [Member] | Real Estate Investment Trust [Member]
    
Pension plan assets by asset category 0 0
Pension Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Real Estate [Member] | Partnership [Member]
    
Pension plan assets by asset category 304 271
Pension Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Other Investments [Member] | Private Equity [Member]
    
Pension plan assets by asset category 448 400
Pension Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Other Investments [Member] | Debt [Member]
    
Pension plan assets by asset category 243 262
Pension Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Other Investments [Member] | Hedge Funds [Member]
    
Pension plan assets by asset category 290 345
Other Postretirement Benefits [Member]
    
Pension plan assets by asset category 1,042 [2] 1,032 [2]
Excludes net assets related to cash and pending sales and purchases of securities   1
Other Postretirement Benefits [Member] | Cash and Cash Equivalents [Member]
    
Pension plan assets by asset category 5 13
Other Postretirement Benefits [Member] | US Equity [Member] | Large Cap Value [Member]
    
Pension plan assets by asset category 326 336
Other Postretirement Benefits [Member] | US Equity [Member] | Equity Securities, Other [Member]
    
Pension plan assets by asset category 61 61
Other Postretirement Benefits [Member] | Non US Equity [Member] | Large Cap Value [Member]
    
Pension plan assets by asset category 80 87
Other Postretirement Benefits [Member] | Non US Equity [Member] | Equity Securities, Other [Member]
    
Pension plan assets by asset category 13 22
Other Postretirement Benefits [Member] | Fixed Income Securities [Member] | Corporate Debt Securities [Member]
    
Pension plan assets by asset category 151 107
Other Postretirement Benefits [Member] | Fixed Income Securities [Member] | US Government Debt Securities [Member]
    
Pension plan assets by asset category 260 256
Other Postretirement Benefits [Member] | Fixed Income Securities [Member] | US States and Political Subdivisions Debt Securities [Member]
    
Pension plan assets by asset category 6 8
Other Postretirement Benefits [Member] | Fixed Income Securities [Member] | Other Debt Securities [Member]
    
Pension plan assets by asset category 2 0
Other Postretirement Benefits [Member] | Real Estate [Member] | Real Estate Investment Trust [Member]
    
Pension plan assets by asset category 1 2
Other Postretirement Benefits [Member] | Real Estate [Member] | Partnership [Member]
    
Pension plan assets by asset category 24 22
Other Postretirement Benefits [Member] | Other Investments [Member] | Private Equity [Member]
    
Pension plan assets by asset category 63 61
Other Postretirement Benefits [Member] | Other Investments [Member] | Debt [Member]
    
Pension plan assets by asset category 36 40
Other Postretirement Benefits [Member] | Other Investments [Member] | Hedge Funds [Member]
    
Pension plan assets by asset category 14 17
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member]
    
Pension plan assets by asset category 158 [2] 166 [2]
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
    
Pension plan assets by asset category 0 0
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | US Equity [Member] | Large Cap Value [Member]
    
Pension plan assets by asset category 38 43
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | US Equity [Member] | Equity Securities, Other [Member]
    
Pension plan assets by asset category 17 20
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Non US Equity [Member] | Large Cap Value [Member]
    
Pension plan assets by asset category 77 87
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Non US Equity [Member] | Equity Securities, Other [Member]
    
Pension plan assets by asset category 9 5
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities [Member] | Corporate Debt Securities [Member]
    
Pension plan assets by asset category 2 1
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities [Member] | US Government Debt Securities [Member]
    
Pension plan assets by asset category 14 8
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities [Member] | US States and Political Subdivisions Debt Securities [Member]
    
Pension plan assets by asset category 0 0
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities [Member] | Other Debt Securities [Member]
    
Pension plan assets by asset category 0 0
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Real Estate [Member] | Real Estate Investment Trust [Member]
    
Pension plan assets by asset category 1 2
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Real Estate [Member] | Partnership [Member]
    
Pension plan assets by asset category 0 0
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Other Investments [Member] | Private Equity [Member]
    
Pension plan assets by asset category 0 0
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Other Investments [Member] | Debt [Member]
    
Pension plan assets by asset category 0 0
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 1 [Member] | Other Investments [Member] | Hedge Funds [Member]
    
Pension plan assets by asset category 0 0
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member]
    
Pension plan assets by asset category 747 [2] 726 [2]
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]
    
Pension plan assets by asset category 5 13
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | US Equity [Member] | Large Cap Value [Member]
    
Pension plan assets by asset category 288 293
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | US Equity [Member] | Equity Securities, Other [Member]
    
Pension plan assets by asset category 44 41
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Non US Equity [Member] | Large Cap Value [Member]
    
Pension plan assets by asset category 3 0
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Non US Equity [Member] | Equity Securities, Other [Member]
    
Pension plan assets by asset category 4 17
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities [Member] | Corporate Debt Securities [Member]
    
Pension plan assets by asset category 149 106
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities [Member] | US Government Debt Securities [Member]
    
Pension plan assets by asset category 246 248
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities [Member] | US States and Political Subdivisions Debt Securities [Member]
    
Pension plan assets by asset category 6 8
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities [Member] | Other Debt Securities [Member]
    
Pension plan assets by asset category 2 0
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Real Estate [Member] | Real Estate Investment Trust [Member]
    
Pension plan assets by asset category 0 0
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Real Estate [Member] | Partnership [Member]
    
Pension plan assets by asset category 0 0
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Other Investments [Member] | Private Equity [Member]
    
Pension plan assets by asset category 0 0
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Other Investments [Member] | Debt [Member]
    
Pension plan assets by asset category 0 0
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Other Investments [Member] | Hedge Funds [Member]
    
Pension plan assets by asset category 0 0
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member]
    
Pension plan assets by asset category 137 [2] 140 [2]
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member]
    
Pension plan assets by asset category 0 0
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | US Equity [Member] | Large Cap Value [Member]
    
Pension plan assets by asset category 0 0
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | US Equity [Member] | Equity Securities, Other [Member]
    
Pension plan assets by asset category 0 0
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Non US Equity [Member] | Large Cap Value [Member]
    
Pension plan assets by asset category 0 0
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Non US Equity [Member] | Equity Securities, Other [Member]
    
Pension plan assets by asset category 0 0
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Income Securities [Member] | Corporate Debt Securities [Member]
    
Pension plan assets by asset category 0 0
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Income Securities [Member] | US Government Debt Securities [Member]
    
Pension plan assets by asset category 0 0
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Income Securities [Member] | US States and Political Subdivisions Debt Securities [Member]
    
Pension plan assets by asset category 0 0
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Income Securities [Member] | Other Debt Securities [Member]
    
Pension plan assets by asset category 0 0
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Real Estate [Member] | Real Estate Investment Trust [Member]
    
Pension plan assets by asset category 0 0
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Real Estate [Member] | Partnership [Member]
    
Pension plan assets by asset category 24 22
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Other Investments [Member] | Private Equity [Member]
    
Pension plan assets by asset category 63 61
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Other Investments [Member] | Debt [Member]
    
Pension plan assets by asset category 36 40
Other Postretirement Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Other Investments [Member] | Hedge Funds [Member]
    
Pension plan assets by asset category $ 14 $ 17
[1] Includes net assets related to pending sales of securities of $26 million at December 31, 2010.
[2] Includes net assets related to pending sales of securities of $1 million at December 31, 2010.