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Postretirement Benefit Plans (Details 13) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Pension [Member]
Dec. 31, 2010
Pension [Member]
Dec. 31, 2009
Pension [Member]
Dec. 31, 2011
Pension [Member]
Level 3 [Member]
Dec. 31, 2010
Pension [Member]
Level 3 [Member]
Dec. 31, 2011
Equities securities [Member]
Pension [Member]
Level 3 [Member]
Dec. 31, 2010
Equities securities [Member]
Pension [Member]
Level 3 [Member]
Dec. 31, 2010
Private equity [Member]
Pension [Member]
Dec. 31, 2011
Private equity [Member]
Pension [Member]
Level 3 [Member]
Dec. 31, 2010
Private equity [Member]
Pension [Member]
Level 3 [Member]
Dec. 31, 2010
Absolute Return [Member]
Pension [Member]
Dec. 31, 2011
Absolute Return [Member]
Pension [Member]
Level 3 [Member]
Dec. 31, 2010
Absolute Return [Member]
Pension [Member]
Level 3 [Member]
Dec. 31, 2010
Commodities, fixed income and other [Member]
Pension [Member]
Dec. 31, 2011
Commodities, fixed income and other [Member]
Pension [Member]
Level 3 [Member]
Dec. 31, 2010
Commodities, fixed income and other [Member]
Pension [Member]
Level 3 [Member]
Fair value measurement pension plan and postretirement welfare                                    
Plan assets - January 1 $ 192 $ 195 $ 184 $ 187 $ 176 $ 82 $ 79 $ 11 $ 9 $ 55 $ 48 $ 47 $ 32 $ 20 $ 21 $ 19 $ 3 $ 2
Realized gains (losses), net           2 4 (1) 0   3 4   0 0   0 0
Unrealized gains (losses), net           0 5 0 2   0 2   0 1   0 0
Purchases/(sales) and settlements, net           (84) (1) (10) 0   (51) 0   (20) (2)   (3) 1
Transfers in (out), net           0 (5) 0 0   0 (5)   0 0   0 0
Plan assets - December 31 $ 192 $ 195 $ 184 $ 187 $ 176 $ 0 $ 82 $ 0 $ 11 $ 55 $ 0 $ 48 $ 32 $ 0 $ 20 $ 19 $ 0 $ 3