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Equity AOCI (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance $ 1,204   $ 384  
Other comprehensive income (loss) before reclassifications 69   949  
Amounts reclassified from other comprehensive income (203)   (263)  
Total other comprehensive income (loss) (134) 746 686 1,436
Ending balance 1,070   1,070  
Available-for-Sale Securities [Member]
       
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 1,599 [1]   934 [1]  
Other comprehensive income (loss) before reclassifications 70 [1]   805 [1]  
Amounts reclassified from other comprehensive income (203) [1]   (273) [1]  
Total other comprehensive income (loss) (133) [1]   532 [1]  
Ending balance 1,466 [1]   1,466 [1]  
Accumulated Other Comprehensive Income (Loss), Other [Member]
       
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (395) [2]   (550) [2]  
Other comprehensive income (loss) before reclassifications (1) [2]   144 [2]  
Amounts reclassified from other comprehensive income 0 [2]   10 [2]  
Total other comprehensive income (loss) (1) [2]   154 [2]  
Ending balance $ (396) [2]   $ (396) [2]  
[1] ) The amounts reclassified from AOCI represent the gain or loss recognized in earnings due to a sale of an available-for-sale security or the recognition of a net impairment recognized in earnings.
[2] ) Primarily represents activity from our defined benefit pension plans.