Fair Value Measurement (Tables)

3 Months Ended

Mar. 31, 2014

Fair Value Disclosures [Abstract]

Assets and Liabilities Reported at Fair Value on a Recurring Basis

Assets and liabilities reported at fair value on a recurring basis:

	March 31, 2014
($ in Millions)	Level 1		Level 2		Level 3
Assets:
Short-term investments:
Marketable equity securities	$	5	$	—	$	—
Other current assets:
Foreign currency forward contracts	—		3		—
Equity forward arrangement	—		214		—
Investments:
Marketable equity securities	73		—		—
Liabilities:
Accounts payable and accrued liabilities:
Foreign currency forward contracts	—		9		—
Other liabilities:
Cross currency swaps	—		101		—
Foreign currency forward contracts			10
	December 31, 2013
($ in Millions)	Level 1		Level 2		Level 3
Assets:
Short-term investments:
Commercial paper and certificates of deposit	$	—	$	50	$	—
Other current assets:
Marketable equity securities	5		—		—
Foreign currency forward contracts	—		25		—
Equity forward arrangement	—		207		—
Investments:
Marketable equity securities	70		—		—
Other assets:
Foreign currency forward contracts	—		2		—
Liabilities:
Accounts payable and accrued liabilities:
Foreign currency forward contracts	—		7		—
Other liabilities:
Cross currency swaps	—		120		—
Foreign currency forward contracts	—		11		—