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Consolidated Statement of Changes in Equity (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance     $ 9,958 $ 9,207
Net income 388 421 802 882
Other comprehensive income     1 3
Dividends declared on common stock     (349) (345)
Dividends declared on preferred and preference stock     (66) (44)
Stock-based compensation and other     (24) (7)
Noncash stock-based compensation and other     13 13
Issuance of preference stock     804 123
Redemption of preference stock     (75)  
Balance 11,064 9,832 11,064 9,832
Common Stock
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance     2,168 2,168
Net income     0 0
Other comprehensive income     0 0
Dividends declared on common stock     0 0
Dividends declared on preferred and preference stock     0 0
Stock-based compensation and other     0 0
Noncash stock-based compensation and other     0 0
Issuance of preference stock     0 0
Redemption of preference stock     0  
Balance 2,168 2,168 2,168 2,168
Additional Paid-in Capital
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance     596 572
Net income     0 0
Other comprehensive income     0 0
Dividends declared on common stock     0 0
Dividends declared on preferred and preference stock     0 0
Stock-based compensation and other     11 5
Noncash stock-based compensation and other     13 12
Issuance of preference stock     (21) (2)
Redemption of preference stock     1  
Balance 600 587 600 587
Accumulated Other Comprehensive Loss
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance     (24) (25)
Net income     0 0
Other comprehensive income     1 3
Dividends declared on common stock     0 0
Dividends declared on preferred and preference stock     0 0
Stock-based compensation and other     0 0
Noncash stock-based compensation and other     0 0
Issuance of preference stock     0 0
Redemption of preference stock     0  
Balance (23) (22) (23) (22)
Retained Earnings
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance     6,173 5,572
Net income     802 882
Other comprehensive income     0 0
Dividends declared on common stock     (349) (345)
Dividends declared on preferred and preference stock     (66) (44)
Stock-based compensation and other     (35) (12)
Noncash stock-based compensation and other     0 1
Issuance of preference stock     0 0
Redemption of preference stock     (1)  
Balance 6,524 6,054 6,524 6,054
Preferred and Preference Stock
        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance     1,045 920
Net income     0 0
Other comprehensive income     0 0
Dividends declared on common stock     0 0
Dividends declared on preferred and preference stock     0 0
Stock-based compensation and other     0 0
Noncash stock-based compensation and other     0 0
Issuance of preference stock     825 125
Redemption of preference stock     (75)  
Balance $ 1,795 $ 1,045 $ 1,795 $ 1,045