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Long-Term Debt (Tables)
 3 Months Ended
Mar. 31, 2013
Debt Disclosure [Abstract]  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
(in millions)
March 31,
2013
December 31,
2012
Total debt at par value
$
12,267

$
12,633

Unamortized discount, net
(490
)
(527
)
Net carrying amount
$
11,777

$
12,106

Fair value
$
12,600

$
13,000