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Acquired Property Net (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Acquired Property [Roll Forward]      
Beginning balance, January 1 $ 10,489 [1] $ 11,373 [1] $ 16,173 [1]
Additions 15,662 16,292 18,049
Disposals (13,919) (16,629) (21,617)
Write-downs, net of recoveries (611) (547) (1,232)
Ending balance, December 31 11,621 [1] 10,489 [1] 11,373 [1]
Valuation allowance $ 686 $ 669 $ 1,000
[1] Includes valuation allowance of $686 million, $669 million and $1.0 billion for the years ended December 31, 2013, 2012 and 2011, respectively.