Debt (Tables)

3 Months Ended

6 Months Ended

Jun. 30, 2013

Jun. 30, 2013

Debt Disclosure [Abstract]

Key Components of Convertible Debt

Our long-term debt as of June 30, 2013 was as follows (dollars in millions):

Senior Notes	Issued at Discount to Par		Carrying Value
$2.5 billion 1.875% Notes due 2018	99.943	%	$	2,499
$2.0 billion 2.650% Notes due 2020	99.760	%	$	1,995
$1.0 billion 3.375% Notes due 2023	99.925	%	$	999
			$	5,493

The following tables represent the key components of our interest expense on convertible debt (tables in millions):

	For the Three Months Ended
	June 30, 2013		June 30, 2012
Contractual interest expense on the coupon	$	7	$	7
Amortization of the discount component recognized as interest expense	16		15
Total interest expense on the convertible debt	$	23	$	22

	For the Six Months Ended
	June 30, 2013		June 30, 2012
Contractual interest expense on the coupon	$	15	$	15
Amortization of the discount component recognized as interest expense	31		30
Total interest expense on the convertible debt	$	46	$	45