v2.4.0.8
Equity Shareholders's Equity (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Changes in Shareholders' equity        
Balance at December 31, 2012     $ 15,155  
Net income 497 382 877 693
Net current-period other comprehensive (loss) income (72) (242) (306) (16)
Cash dividends paid     (401)  
Issuance of shares under equity-based compensation plans-net     106  
Balance at June 30, 2013 15,431   15,431  
Parent [Member]
       
Changes in Shareholders' equity        
Balance at December 31, 2012     15,113  
Net income     872  
Net current-period other comprehensive (loss) income     (306)  
Cash dividends paid     (397)  
Issuance of shares under equity-based compensation plans-net     106  
Balance at June 30, 2013 15,388   15,388  
Noncontrolling Interest [Member]
       
Changes in Shareholders' equity        
Balance at December 31, 2012     42  
Net income     5  
Net current-period other comprehensive (loss) income     0  
Cash dividends paid     (4)  
Issuance of shares under equity-based compensation plans-net     0  
Balance at June 30, 2013 $ 43   $ 43