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Other Financial Data (Other Liabilities) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Other Liabilities [Abstract]    
Defined benefit plans, including split dollar life insurance arrangements $ 1,751 $ 3,379
Postretirement health care benefit plan 117 167
Deferred revenue 162 178
Unrecognized tax benefits 99 94
Other 185 202
Other liabilities $ 2,314 $ 4,020