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Employee Retirement Plans (Details 6) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Asset Categories:      
Fair values of plan assets $ 965 $ 1,022  
Equity [Member]
     
Asset Categories:      
Fair values of plan assets 608 672  
Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 209 207  
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Equity [Member]
     
Asset Categories:      
Fair values of plan assets 355 408  
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 0 0  
Significant Other Observable Inputs (Level 2) [Member] | Equity [Member]
     
Asset Categories:      
Fair values of plan assets 253 264  
Significant Other Observable Inputs (Level 2) [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 208 206  
Significant Unobservable Inputs (Level 3) [Member]
     
Asset Categories:      
Fair values of plan assets 122 128 68
Significant Unobservable Inputs (Level 3) [Member] | Equity [Member]
     
Asset Categories:      
Fair values of plan assets 0 0  
Significant Unobservable Inputs (Level 3) [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 1 1  
Common and Preferred Stock [Member] | Equity [Member]
     
Asset Categories:      
Fair values of plan assets 214 250  
Common and Preferred Stock [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Equity [Member]
     
Asset Categories:      
Fair values of plan assets 214 250  
Common and Preferred Stock [Member] | Significant Other Observable Inputs (Level 2) [Member] | Equity [Member]
     
Asset Categories:      
Fair values of plan assets 0 0  
Common and Preferred Stock [Member] | Significant Unobservable Inputs (Level 3) [Member] | Equity [Member]
     
Asset Categories:      
Fair values of plan assets 0 0  
USG common stock [Member] | Equity [Member]
     
Asset Categories:      
Fair values of plan assets 47 52  
USG common stock [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Equity [Member]
     
Asset Categories:      
Fair values of plan assets 47 52  
USG common stock [Member] | Significant Other Observable Inputs (Level 2) [Member] | Equity [Member]
     
Asset Categories:      
Fair values of plan assets 0 0  
USG common stock [Member] | Significant Unobservable Inputs (Level 3) [Member] | Equity [Member]
     
Asset Categories:      
Fair values of plan assets 0 0  
Commingled Pooled Mutual Funds [Member] | Equity [Member]
     
Asset Categories:      
Fair values of plan assets 347 370  
Commingled Pooled Mutual Funds [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Equity [Member]
     
Asset Categories:      
Fair values of plan assets 94 106  
Commingled Pooled Mutual Funds [Member] | Significant Other Observable Inputs (Level 2) [Member] | Equity [Member]
     
Asset Categories:      
Fair values of plan assets 253 264  
Commingled Pooled Mutual Funds [Member] | Significant Unobservable Inputs (Level 3) [Member] | Equity [Member]
     
Asset Categories:      
Fair values of plan assets 0 0  
Fixed Income Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
     
Asset Categories:      
Fair values of plan assets 1 1 0
U.S. government and agency debt securities [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 7 12  
U.S. government and agency debt securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 0 0  
U.S. government and agency debt securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 7 12  
U.S. government and agency debt securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 0 0  
Non-U.S. government and agency debt [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 14 14  
Non-U.S. government and agency debt [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 0 0  
Non-U.S. government and agency debt [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 14 14  
Non-U.S. government and agency debt [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 0 0  
Corporate debt securities [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 12 34  
Corporate debt securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 0 0  
Corporate debt securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 12 34  
Corporate debt securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 0 0  
Mortgage backed and asset backed securities [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 1 36  
Mortgage backed and asset backed securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 0 0  
Mortgage backed and asset backed securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 1 36  
Mortgage backed and asset backed securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 0 0  
Commingled Pooled Funds [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 174 105  
Commingled Pooled Funds [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 0 0  
Commingled Pooled Funds [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 174 105  
Commingled Pooled Funds [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 0 0  
Other [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 1 6  
Other [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 0 0  
Other [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 0 5  
Other [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed Income [Member]
     
Asset Categories:      
Fair values of plan assets 1 1  
Limited partnerships [Member]
     
Asset Categories:      
Fair values of plan assets 88 102  
Limited partnerships [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
     
Asset Categories:      
Fair values of plan assets 0 0  
Limited partnerships [Member] | Significant Other Observable Inputs (Level 2) [Member]
     
Asset Categories:      
Fair values of plan assets 0 0  
Limited partnerships [Member] | Significant Unobservable Inputs (Level 3) [Member]
     
Asset Categories:      
Fair values of plan assets 88 102 49
Real estate [Member]
     
Asset Categories:      
Fair values of plan assets 33 25  
Real estate [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
     
Asset Categories:      
Fair values of plan assets 0 0  
Real estate [Member] | Significant Other Observable Inputs (Level 2) [Member]
     
Asset Categories:      
Fair values of plan assets 0 0  
Real estate [Member] | Significant Unobservable Inputs (Level 3) [Member]
     
Asset Categories:      
Fair values of plan assets 33 25 19
Cash equivalents and short-term investments [Member]
     
Asset Categories:      
Fair values of plan assets 38 67  
Cash equivalents and short-term investments [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
     
Asset Categories:      
Fair values of plan assets 0 0  
Cash equivalents and short-term investments [Member] | Significant Other Observable Inputs (Level 2) [Member]
     
Asset Categories:      
Fair values of plan assets 38 67  
Cash equivalents and short-term investments [Member] | Significant Unobservable Inputs (Level 3) [Member]
     
Asset Categories:      
Fair values of plan assets 0 0  
Receivables [Member]
     
Asset Categories:      
Plan assets receivables 5 22  
Accounts Payable [Member]
     
Asset Categories:      
Plan assets accounts payable (16) (73)  
Fair value of plan assets other than receivable and accounts payable [Member]
     
Asset Categories:      
Fair values of plan assets 976 1,073  
Fair value of plan assets other than receivable and accounts payable [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
     
Asset Categories:      
Fair values of plan assets 355 408  
Fair value of plan assets other than receivable and accounts payable [Member] | Significant Other Observable Inputs (Level 2) [Member]
     
Asset Categories:      
Fair values of plan assets 499 537  
Fair value of plan assets other than receivable and accounts payable [Member] | Significant Unobservable Inputs (Level 3) [Member]
     
Asset Categories:      
Fair values of plan assets $ 122 $ 128