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Shareholders Equity (Details 2) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Treasury Stock [Roll Forward]    
Treasury Stock, Shares, Beginning (shares) 7,609us-gaap_TreasuryStockShares  
Treasury Stock, Shares, Ending (shares) 11,048us-gaap_TreasuryStockShares  
Treasury Stock, Value, Beginning $ 105us-gaap_TreasuryStockValue  
Purchases 216us-gaap_TreasuryStockValueAcquiredCostMethod 275us-gaap_TreasuryStockValueAcquiredCostMethod
Cancellation of treasury stock 0us-gaap_TreasuryStockRetiredCostMethodAmount 0us-gaap_TreasuryStockRetiredCostMethodAmount
Treasury Stock, Value, Ending 147us-gaap_TreasuryStockValue  
Treasury Stock    
Treasury Stock [Roll Forward]    
Treasury Stock, Shares, Beginning (shares) 7,609us-gaap_TreasuryStockShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
 
Purchases (in shares) 16,118us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
[1]  
Cancellations (in shares) (12,679)us-gaap_TreasuryStockSharesRetired
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
 
Treasury Stock, Shares, Ending (shares) 11,048us-gaap_TreasuryStockShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
 
Treasury Stock, Value, Beginning 105us-gaap_TreasuryStockValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
 
Purchases 216us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
[1] 275us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
Cancellation of treasury stock (174)us-gaap_TreasuryStockRetiredCostMethodAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
(323)us-gaap_TreasuryStockRetiredCostMethodAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
Treasury Stock, Value, Ending $ 147us-gaap_TreasuryStockValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
 
[1] Includes associated fees.