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Postretirement Benefits (Details 3) (USD $)
In Millions, unless otherwise specified
12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Employee pension plan
Dec. 31, 2010
Employee pension plan
Dec. 31, 2009
Employee pension plan
Dec. 31, 2008
Employee pension plan
Dec. 31, 2011
Employee pension plan
Equity securities (Total return seeking assets)
Dec. 31, 2010
Employee pension plan
Equity securities (Total return seeking assets)
Dec. 31, 2009
Employee pension plan
Equity securities (Total return seeking assets)
Dec. 31, 2011
Employee pension plan
US equity index
Dec. 31, 2010
Employee pension plan
US equity index
Dec. 31, 2011
Employee pension plan
US large capitalization core equity
Dec. 31, 2010
Employee pension plan
US large capitalization core equity
Dec. 31, 2011
Employee pension plan
International risk-controlled equity
Dec. 31, 2010
Employee pension plan
International risk-controlled equity
Dec. 31, 2011
Employee pension plan
US small capitalization core equity
Dec. 31, 2010
Employee pension plan
US small capitalization core equity
Dec. 31, 2011
Employee pension plan
International small capitalization risk-controlled equity
Dec. 31, 2010
Employee pension plan
International small capitalization risk-controlled equity
Dec. 31, 2011
Employee pension plan
Emerging markets equity
Dec. 31, 2010
Employee pension plan
Emerging markets equity
Dec. 31, 2011
Employee pension plan
Fixed income/debt securities (Total liability matching assets)
Dec. 31, 2010
Employee pension plan
Fixed income/debt securities (Total liability matching assets)
Dec. 31, 2009
Employee pension plan
Fixed income/debt securities (Total liability matching assets)
Dec. 31, 2011
Employee pension plan
Long duration fixed income
Dec. 31, 2010
Employee pension plan
Long duration fixed income
Dec. 31, 2011
Employee pension plan
Broad market fixed income
Dec. 31, 2010
Employee pension plan
Broad market fixed income
Dec. 31, 2011
Employee pension plan
Long duration corporate fixed income
Dec. 31, 2010
Employee pension plan
Long duration corporate fixed income
Dec. 31, 2011
Employee pension plan
Institutional money market fund
Dec. 31, 2010
Employee pension plan
Institutional money market fund
Benefits expected to be paid over the next 10 years from pension and other postretirement plans                                                                
2012 $ 9                                                              
2013 10                                                              
2014 11                                                              
2015 13                                                              
2016 15                                                              
2017-2021 110                                                              
Information for pension plans with an accumulated benefit obligation in excess of plan assets:                                                                
Projected benefit obligation 488 10                                                            
Accumulated benefit obligation 363 5                                                            
Fair value of plan assets 348 0 348 328 279 218                                                    
Expected employer contribution during next fiscal year     $ 16                                                          
Target asset allocation for the portfolio                                                                
Total plan assets (as a percent)     100.00% 100.00%     60.00% 60.00% 60.00% 17.00% 17.00% 16.00% 16.00% 15.00% 15.00% 8.00% 8.00% 2.00% 2.00% 2.00% 2.00% 40.00% 40.00% 40.00% 16.00% 16.00% 15.00% 15.00% 8.00% 8.00% 1.00% 1.00%
Actual asset allocation for the portfolio                                                                
Total plan assets (as a percent)     100.00% 100.00%     60.00% 60.00%   17.00% 17.00% 16.00% 16.00% 15.00% 15.00% 8.00% 8.00% 2.00% 2.00% 2.00% 2.00% 40.00% 40.00%   16.00% 16.00% 15.00% 15.00% 8.00% 8.00% 1.00% 1.00%