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Debt - Debt Maturities (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Dec. 31, 2013
Commercial mortgage-backed securities loan [member]
Variable Rate Debt [Member]
Extension
Debt Instrument [Line Items]      
2014 $ 61 $ 52  
2015 109 69  
2016 363 622  
2017 139 96  
2018 4,110 4,068 [1]  
Thereafter 7,558 7,845  
Long-term debt and capital lease obligations, gross $ 12,340 $ 12,752  
Debt instrument, extension term     1 year
Debt instrument, number of extensions     3
Debt instrument, maturity date     2018-11-01
[1] The CMBS Loan has three one-year extensions solely at our option that effectively extend maturity to November 1, 2018. We have assumed all extensions for purposes of calculating maturity dates.