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Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Reconciliation of the beginning and ending balances of the carrying amount of equity        
Balance as of beginning of period     $ 16,445 $ 15,025
Net income (loss) 673 1,203 1,071 2,044
Dividends     (263) (85)
Stock-based compensation expense     29 34
Tax deduction in excess of stock-based compensation expense     16 19
Transactions in connection with stock-based compensation plans:        
Stock issuances     36 42
Stock repurchases     (138) (270)
Contributions from noncontrolling interest     34 14
Recognition of noncontrolling interest in connection with Pembroke Acquisition     0 3
Other comprehensive income (loss) 133 (266) 156 (156)
Balance as of end of period 17,386 16,670 17,386 16,670
Share Activity Rollforward        
Treasury stock, shares, beginning balance     (116,689,450)  
Treasury Stock, shares, ending balance (120,035,210)   (120,035,210)  
Common Stock [Member]
        
Share Activity Rollforward        
Common stock, shares, beginning balance     673,000,000 673,000,000
Stock issuances, stock-based compensation     0 0
Common stock, shares, ending balance 673,000,000 673,000,000 673,000,000 673,000,000
Treasury Stock [Member]
        
Share Activity Rollforward        
Treasury stock, shares, beginning balance     (117,000,000) (105,000,000)
Stock issuances, stock-based compensation     3,000,000 4,000,000
Stock purchases, stock-based compensation     (6,000,000) (14,000,000)
Treasury Stock, shares, ending balance (120,000,000) (115,000,000) (120,000,000) (115,000,000)
Parent [Member]
        
Reconciliation of the beginning and ending balances of the carrying amount of equity        
Balance as of beginning of period     16,423 15,025
Net income (loss)     1,073 2,045
Dividends     (263) (85)
Stock-based compensation expense     29 34
Tax deduction in excess of stock-based compensation expense     16 19
Transactions in connection with stock-based compensation plans:        
Stock issuances     36 42
Stock repurchases     (138) (270)
Contributions from noncontrolling interest     0 0
Recognition of noncontrolling interest in connection with Pembroke Acquisition     0 0
Other comprehensive income (loss)     156 (156)
Balance as of end of period 17,332 16,654 17,332 16,654
Noncontrolling Interest [Member]
        
Reconciliation of the beginning and ending balances of the carrying amount of equity        
Balance as of beginning of period     22 0
Net income (loss)     (2) (1)
Dividends     0 0
Stock-based compensation expense     0 0
Tax deduction in excess of stock-based compensation expense     0 0
Transactions in connection with stock-based compensation plans:        
Stock issuances     0 0
Stock repurchases     0 0
Contributions from noncontrolling interest     34 14
Recognition of noncontrolling interest in connection with Pembroke Acquisition     0 3
Other comprehensive income (loss)     0 0
Balance as of end of period $ 54 $ 16 $ 54 $ 16