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Retirement Plans (Details 9) (USD $)
In Millions, unless otherwise specified
12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Pension Plans, Defined Benefit [Member]
Dec. 31, 2012
Equity securities [Member]
Domestic [Member]
Dec. 31, 2011
Equity securities [Member]
Domestic [Member]
Dec. 31, 2012
Equity securities [Member]
International [Member]
Dec. 31, 2011
Equity securities [Member]
International [Member]
Dec. 31, 2012
Equity securities [Member]
Pension Plans, Defined Benefit [Member]
Domestic [Member]
Dec. 31, 2011
Equity securities [Member]
Pension Plans, Defined Benefit [Member]
Domestic [Member]
Dec. 31, 2012
Equity securities [Member]
Pension Plans, Defined Benefit [Member]
International [Member]
Dec. 31, 2011
Equity securities [Member]
Pension Plans, Defined Benefit [Member]
International [Member]
Dec. 31, 2012
Fixed Income Funds [Member]
Domestic [Member]
Dec. 31, 2011
Fixed Income Funds [Member]
Domestic [Member]
Dec. 31, 2012
Fixed Income Funds [Member]
International [Member]
Dec. 31, 2011
Fixed Income Funds [Member]
International [Member]
Dec. 31, 2012
Fixed Income Funds [Member]
Pension Plans, Defined Benefit [Member]
Domestic [Member]
Dec. 31, 2011
Fixed Income Funds [Member]
Pension Plans, Defined Benefit [Member]
Domestic [Member]
Dec. 31, 2012
Fixed Income Funds [Member]
Pension Plans, Defined Benefit [Member]
International [Member]
Dec. 31, 2011
Fixed Income Funds [Member]
Pension Plans, Defined Benefit [Member]
International [Member]
Dec. 31, 2012
Balanced Funds [Member]
Dec. 31, 2011
Balanced Funds [Member]
Dec. 31, 2012
Balanced Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Balanced Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2012
Cash and Cash Equivalents [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
Dec. 31, 2012
Cash and Cash Equivalents [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2012
Other Funds [Member]
Dec. 31, 2011
Other Funds [Member]
Dec. 31, 2012
Other Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Other Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2012
Level 1 [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Level 1 [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2012
Level 1 [Member]
Equity securities [Member]
Pension Plans, Defined Benefit [Member]
Domestic [Member]
Dec. 31, 2011
Level 1 [Member]
Equity securities [Member]
Pension Plans, Defined Benefit [Member]
Domestic [Member]
Dec. 31, 2012
Level 1 [Member]
Equity securities [Member]
Pension Plans, Defined Benefit [Member]
International [Member]
Dec. 31, 2011
Level 1 [Member]
Equity securities [Member]
Pension Plans, Defined Benefit [Member]
International [Member]
Dec. 31, 2012
Level 1 [Member]
Fixed Income Funds [Member]
Pension Plans, Defined Benefit [Member]
Domestic [Member]
Dec. 31, 2011
Level 1 [Member]
Fixed Income Funds [Member]
Pension Plans, Defined Benefit [Member]
Domestic [Member]
Dec. 31, 2012
Level 1 [Member]
Fixed Income Funds [Member]
Pension Plans, Defined Benefit [Member]
International [Member]
Dec. 31, 2011
Level 1 [Member]
Fixed Income Funds [Member]
Pension Plans, Defined Benefit [Member]
International [Member]
Dec. 31, 2012
Level 1 [Member]
Balanced Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Level 1 [Member]
Balanced Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2012
Level 1 [Member]
Cash and Cash Equivalents [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Level 1 [Member]
Cash and Cash Equivalents [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2012
Level 1 [Member]
Other Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Level 1 [Member]
Other Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2012
Level 2 [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Level 2 [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2012
Level 2 [Member]
Equity securities [Member]
Pension Plans, Defined Benefit [Member]
Domestic [Member]
Dec. 31, 2011
Level 2 [Member]
Equity securities [Member]
Pension Plans, Defined Benefit [Member]
Domestic [Member]
Dec. 31, 2012
Level 2 [Member]
Equity securities [Member]
Pension Plans, Defined Benefit [Member]
International [Member]
Dec. 31, 2011
Level 2 [Member]
Equity securities [Member]
Pension Plans, Defined Benefit [Member]
International [Member]
Dec. 31, 2012
Level 2 [Member]
Fixed Income Funds [Member]
Pension Plans, Defined Benefit [Member]
Domestic [Member]
Dec. 31, 2011
Level 2 [Member]
Fixed Income Funds [Member]
Pension Plans, Defined Benefit [Member]
Domestic [Member]
Dec. 31, 2012
Level 2 [Member]
Fixed Income Funds [Member]
Pension Plans, Defined Benefit [Member]
International [Member]
Dec. 31, 2011
Level 2 [Member]
Fixed Income Funds [Member]
Pension Plans, Defined Benefit [Member]
International [Member]
Dec. 31, 2012
Level 2 [Member]
Balanced Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Level 2 [Member]
Balanced Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2012
Level 2 [Member]
Cash and Cash Equivalents [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Level 2 [Member]
Cash and Cash Equivalents [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2012
Level 2 [Member]
Other Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Level 2 [Member]
Other Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2012
Level 3 [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Level 3 [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2012
Level 3 [Member]
Equity securities [Member]
Pension Plans, Defined Benefit [Member]
Domestic [Member]
Dec. 31, 2011
Level 3 [Member]
Equity securities [Member]
Pension Plans, Defined Benefit [Member]
Domestic [Member]
Dec. 31, 2012
Level 3 [Member]
Equity securities [Member]
Pension Plans, Defined Benefit [Member]
International [Member]
Dec. 31, 2011
Level 3 [Member]
Equity securities [Member]
Pension Plans, Defined Benefit [Member]
International [Member]
Dec. 31, 2012
Level 3 [Member]
Fixed Income Funds [Member]
Pension Plans, Defined Benefit [Member]
Domestic [Member]
Dec. 31, 2011
Level 3 [Member]
Fixed Income Funds [Member]
Pension Plans, Defined Benefit [Member]
Domestic [Member]
Dec. 31, 2012
Level 3 [Member]
Fixed Income Funds [Member]
Pension Plans, Defined Benefit [Member]
International [Member]
Dec. 31, 2011
Level 3 [Member]
Fixed Income Funds [Member]
Pension Plans, Defined Benefit [Member]
International [Member]
Dec. 31, 2012
Level 3 [Member]
Balanced Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Level 3 [Member]
Balanced Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2012
Level 3 [Member]
Cash and Cash Equivalents [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Level 3 [Member]
Cash and Cash Equivalents [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2012
Level 3 [Member]
Other Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Level 3 [Member]
Other Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Level 3 [Member]
Other Funds [Member]
Pension Plans, Defined Benefit [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis                                                                                                                                                                    
Target allocation percentage of assets 100.00% 100.00%       15.00% 15.00% 30.00% 30.00%         30.00% 30.00% 15.00% 15.00%                                                                                                                                  
Total target asset allocations                                           5.00% 5.00%     0.00% 0.00%     5.00% 5.00%                                                                                                      
Fair value of plan assets     $ 2,309 $ 2,069 $ 2,052         $ 318 $ 250 $ 732 $ 644         $ 639 $ 582 $ 447 $ 406     $ 72 $ 69     $ 25 $ 12     $ 76 $ 106 $ 1,075 $ 906 $ 318 $ 250 $ 732 $ 644 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 25 $ 12 $ 0 $ 0 $ 1,158 $ 1,057 $ 0 $ 0 $ 0 $ 0 $ 639 $ 582 $ 447 $ 406 $ 72 $ 69 $ 0 $ 0 $ 0 $ 0 $ 76 $ 106 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 76 $ 106 $ 101