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Stockholders' Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Mar. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Stockholders' Equity [Abstract]            
Common stock, shares authorized (in shares)       1,000,000,000us-gaap_CommonStockSharesAuthorized 1,000,000,000us-gaap_CommonStockSharesAuthorized  
Common stock, par value (in dollars per share)       $ 0.10us-gaap_CommonStockParOrStatedValuePerShare $ 0.10us-gaap_CommonStockParOrStatedValuePerShare  
Preferred stock, shares authorized       4,500,000us-gaap_PreferredStockSharesAuthorized    
Preferred stock par value per share       $ 1.00us-gaap_PreferredStockParOrStatedValuePerShare    
Payments of ordinary dividends       $ 386us-gaap_PaymentsOfOrdinaryDividends $ 348us-gaap_PaymentsOfOrdinaryDividends $ 324us-gaap_PaymentsOfOrdinaryDividends
Dividends paid per share $ 0.24us-gaap_CommonStockDividendsPerShareCashPaid $ 0.22us-gaap_CommonStockDividendsPerShareCashPaid $ 0.20us-gaap_CommonStockDividendsPerShareCashPaid      
Proceeds from stock option exercises       $ 93us-gaap_ProceedsFromStockOptionsExercised $ 3us-gaap_ProceedsFromStockOptionsExercised $ 27us-gaap_ProceedsFromStockOptionsExercised