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Balance Sheet - Parent Company Only (Additional Information) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Treasury Stock, Value $ 1,032us-gaap_TreasuryStockValue [1] $ 615us-gaap_TreasuryStockValue [1]  
Treasury Stock and Other      
Treasury Stock, Value (1,119)us-gaap_TreasuryStockValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember		 (684)us-gaap_TreasuryStockValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember		  
Deferred Compensation Equity $ (21)us-gaap_DeferredCompensationEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember		 $ (50)us-gaap_DeferredCompensationEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember		 $ 48us-gaap_DeferredCompensationEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
[1] Includes noncontrolling interest of $108 million and $119 million at December 31, 2014 and December 31, 2013, respectively.