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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Accounts receivable, allowance $ 162us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 155us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Preferred stock- non-redeemable, par value (in dollars per share) $ 25.00us-gaap_PreferredStockParOrStatedValuePerShare $ 25.00us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock- non-redeemable, authorized shares (shares) 2,000us-gaap_PreferredStockSharesAuthorized 2,000us-gaap_PreferredStockSharesAuthorized
Preferred stock- non-redeemable, issued shares (shares) 7us-gaap_PreferredStockSharesIssued 7us-gaap_PreferredStockSharesIssued
Preferred stock- non-redeemable, outstanding shares (shares) 7us-gaap_PreferredStockSharesOutstanding 7us-gaap_PreferredStockSharesOutstanding
Common stock, par value (in dollars per share) $ 1.00us-gaap_CommonStockParOrStatedValuePerShare $ 1.00us-gaap_CommonStockParOrStatedValuePerShare
Common stock, authorized shares (shares) 1,600,000us-gaap_CommonStockSharesAuthorized 1,600,000us-gaap_CommonStockSharesAuthorized
Common stock, issued shares (shares) 568,517us-gaap_CommonStockSharesIssued 583,637us-gaap_CommonStockSharesIssued
Common stock, outstanding shares (shares) 568,517us-gaap_CommonStockSharesOutstanding 583,637us-gaap_CommonStockSharesOutstanding