Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2013

Debt Disclosure [Abstract]

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]

(in millions)	September 30, 2013			December 31, 2012
Total debt at par value	$	11,820		$	12,633
Unamortized discount, net	(429		)	(527		)
Net carrying amount	$	11,391		$	12,106
Fair value	$	12,100		$	13,000