v3.2.0.727
Equity Changes in Shareholders's Equity (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Changes in Shareholders' equity        
Balance at December 31, 2014     $ 15,839  
Net income $ 535 $ 172 1,002 $ 613
Other comprehensive loss 230 $ 83 (404) $ 86
Cash dividends paid and accrued     (518)  
Issuance of shares under equity-based compensation plans - net     54  
Repurchase of shares     (170)  
Balance at June 30, 2015 15,803   15,803  
Parent [Member]        
Changes in Shareholders' equity        
Balance at December 31, 2014     15,786  
Net income     1,001  
Other comprehensive loss     (404)  
Cash dividends paid and accrued     (514)  
Issuance of shares under equity-based compensation plans - net     54  
Repurchase of shares     (170)  
Balance at June 30, 2015 15,753   15,753  
Noncontrolling Interest [Member]        
Changes in Shareholders' equity        
Balance at December 31, 2014     53  
Net income     1  
Other comprehensive loss     0  
Cash dividends paid and accrued     (4)  
Issuance of shares under equity-based compensation plans - net     0  
Repurchase of shares     0  
Balance at June 30, 2015 $ 50   $ 50  
2013 Program [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stock Repurchase Program, Number of Shares Authorized to be Repurchased 40.0   40.0  
Stock Repurchased During Period, Shares 1.4   2.4  
Changes in Shareholders' equity        
Repurchase of shares $ (99)   $ (170)