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Shareholders' Equity - Accumulated Balances Related to Each Component of Other Comprehensive Income Loss) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Other comprehensive income (loss), net of tax $ 140 $ (335) $ (196)  
Balance, net of tax 794 670    
Accumulated Other Comprehensive Income (Loss) [Member]
        
OCI movement 121 (337) (190)  
Tax impact 3 28 5  
Other comprehensive income (loss), net of tax 124 (309) (185)  
Balance 752 631 968 1,158
Cumulative tax impact 42 39 11 6
Balance, net of tax 794 670 979 1,164
Unrealized gain (loss) on defined benefit pension plans [Member]
        
OCI movement (39) (78) (19)  
Tax impact 14 18 6  
Other comprehensive income (loss), net of tax (25) (60) (13)  
Balance (205) (166) (88) (69)
Cumulative tax impact 47 33 15 9
Balance, net of tax (158) (133) (73) (60)
Unrealized gain (loss) on derivatives [Member]
        
OCI movement 90 (125) 55  
Tax impact (11) 9    
Other comprehensive income (loss), net of tax 79 (116) 55  
Balance 26 (64) 61 6
Cumulative tax impact (2) 9    
Balance, net of tax 24 (55) 61 6
Unrealized gain (loss) on securities [Member]
        
OCI movement 6 (33) 29  
Tax impact   1 (1)  
Other comprehensive income (loss), net of tax 6 (32) 28  
Balance (1) (7) 26 (3)
Cumulative tax impact (3) (3) (4) (3)
Balance, net of tax (4) (10) 22 (6)
Foreign currency translation adjustment [Member]
        
OCI movement 64 (101) (255)  
Other comprehensive income (loss), net of tax 64 (101) (255)  
Balance 932 868 969 1,224
Balance, net of tax $ 932 $ 868 $ 969 $ 1,224