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Consolidated Statements of Changes in Stockholders' Equity (USD $)
In Millions, except Share data, unless otherwise specified
Total
USD ($)
Series A Preferred Stock [Member]
USD ($)
Series B Preferred Stock [Member]
USD ($)
Preferred Stock [Member]
USD ($)
Common Stock [Member]
USD ($)
Treasury Stock [Member]
USD ($)
Common Stock Shares Outstanding [Member]
Additional Paid-In Capital [Member]
USD ($)
Accumulated Other Comprehensive Income (Loss) [Member]
USD ($)
Retained Earnings [Member]
USD ($)
Retained Earnings [Member]
Series A Preferred Stock [Member]
USD ($)
Retained Earnings [Member]
Series B Preferred Stock [Member]
USD ($)
Total Stockholders' Equity [Member]
USD ($)
Total Stockholders' Equity [Member]
Series A Preferred Stock [Member]
USD ($)
Total Stockholders' Equity [Member]
Series B Preferred Stock [Member]
USD ($)
Noncontrolling Interest [Member]
USD ($)
Beginning Balance, Value at Dec. 31, 2010       $ 565 $ 119                      
Beginning Balance, Shares at Dec. 31, 2010       7,300,000 595,263,474                      
Cash dividends:                                
Retirement of common stock in treasury, Shares         70,000,000                      
Ending Balance, Value at Mar. 31, 2011                                
Beginning Balance, Value at Dec. 31, 2010 5,012     565 119 (1,876)   5,940 (45) 309     5,012      
Beginning Balance, Shares at Dec. 31, 2010       7,300,000 595,263,474 (68,319,589) 526,943,885                  
Comprehensive income:                                
Net income 632                 633     633     (1)
Other comprehensive income, net of tax 31               31       31      
Total comprehensive income 663                       664     (1)
Cash dividends:                                
Common stock (154)                 (154)     (154)      
Preferred stock   (12) (6)               (12) (6)   (12) (6)  
Issuance of common shares 41       1     40         41      
Issuance of common shares, Shares 3,886,217       3,886,217   3,886,217                  
Retirement of common stock in treasury         (14) 1,904   (1,890)                
Retirement of common stock in treasury, Shares         (70,074,369) 70,074,369                    
Tax benefit related to employee stock-based compensation plans (10)             (10)         (10)      
Stock-based compensation expense 56             56         56      
Common stock repurchased (300)         (300)             (300)      
Common stock repurchased, Shares (19,000,000)       (19,054,115) (19,054,115) (19,054,115)                  
Shares repurchased related to employee stock-based compensation plans (48)         (48)             (48)      
Shares repurchased related to employee stock-based compensation plans, Shares (3,024,662)         (3,024,662) (3,024,662)                  
Acquisition of noncontrolling interest 9                             9
Ending Balance, Value at Dec. 31, 2011 5,251     565 106 (320)   4,136 (14) 770     5,243     8
Ending Balance, Shares at Dec. 31, 2011       7,300,000 529,075,322 (20,323,997) 508,751,325                  
Comprehensive income:                                
Net income 937                 939     939     (2)
Other comprehensive income, net of tax 8               8       8      
Total comprehensive income 945                       947     (2)
Cash dividends:                                
Common stock (237)                 (237)     (237)      
Preferred stock   (11) (9)               (11) (9)   (11) (9)  
Dividend equivalent units related to employee stock-based compensation plans (1)                 (1)     (1)      
Issuance of common shares 61       1     60         61      
Issuance of common shares, Shares 6,432,643       6,432,643   6,432,643                  
Tax benefit related to employee stock-based compensation plans (6)             (6)         (6)      
Stock-based compensation expense 47             47         47      
Common stock repurchased (900)         (900)             (900)      
Common stock repurchased, Shares (58,000,000)       (58,038,239) (58,038,239) (58,038,239)                  
Shares repurchased related to employee stock-based compensation plans (74)         (74)             (74)      
Shares repurchased related to employee stock-based compensation plans, Shares (4,547,785)         (4,547,785) (4,547,785)                  
Ending Balance, Value at Dec. 31, 2012 5,066     565 107 (1,294)   4,237 (6) 1,451     5,060     6
Ending Balance, Shares at Dec. 31, 2012       7,300,000 535,507,965 (82,910,021) 452,597,944                  
Comprehensive income:                                
Net income 1,417                 1,418     1,418     (1)
Other comprehensive income, net of tax 19               19       19      
Total comprehensive income 1,436                       1,437     (1)
Cash dividends:                                
Common stock (264)                 (264)     (264)      
Preferred stock   (12) (8)               (12) (8)   (12) (8)  
Dividend equivalent units related to employee stock-based compensation plans (1)                 (1)     (1)      
Issuance of common shares 107       2     105         107      
Issuance of common shares, Shares 9,702,976     0 9,702,976   9,702,976                  
Tax benefit related to employee stock-based compensation plans 10             10         10      
Stock-based compensation expense 47             47         47      
Common stock repurchased (600)         (600)             (600)      
Common stock repurchased, Shares (27,000,000)       (26,987,043) (26,987,043) (26,987,043)                  
Shares repurchased related to employee stock-based compensation plans (139)         (139)             (139)      
Shares repurchased related to employee stock-based compensation plans, Shares (6,365,002)         (6,365,002) (6,365,002)                  
Ending Balance, Value at Dec. 31, 2013 $ 5,642     $ 565 $ 109 $ (2,033)   $ 4,399 $ 13 $ 2,584     $ 5,637     $ 5
Ending Balance, Shares at Dec. 31, 2013       7,300,000 545,210,941 (116,262,066) 428,948,875