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Long-Term Debt (Tables)
 9 Months Ended
Sep. 30, 2014
Debt Disclosure [Abstract]  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
Fair Value of Debt

Market risk associated with our fixed and variable rate long-term debt relates to the potential reduction in fair value and negative impact to future earnings, respectively, from an increase in interest rates. In the table below, the aggregate fair value of debt is based primarily on reported market values, recently completed market transactions and estimates based on interest rates, maturities, credit risk and underlying collateral and is classified primarily as Level 2 within the fair value hierarchy.
(in millions)
September 30,
2014
December 31,
2013
Total debt at par value
$
9,804

$
11,228

Unamortized discount, net
(101
)
(383
)
Net carrying amount
$
9,703

$
10,845

Fair value
$
10,200

$
11,600