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Debt - Debt Maturities (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2014
Extension
Dec. 31, 2013
Dec. 31, 2013
Commercial mortgage-backed securities loan [member]
Variable Rate Debt [Member]
Extension
Debt Disclosure [Abstract]      
2014 $ 34 $ 52  
2015 136 69  
2016 433 622  
2017 164 96  
2018 4,097 [1] 4,068 [2]  
Thereafter 7,224 7,845  
Long-term debt and capital lease obligations, gross $ 12,088 $ 12,752  
Debt Instrument Extension Period 1 year   1 year
Debt Instrument Number Of Extension Options 3   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 assumed all extensions for purposes of calculating maturity dates.
[2] 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.