Derivative Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2014

Derivative Financial Instruments

Schedule of fair values of assets and liabilities associated with the derivative financial instruments

	Assets				Liabilities
	December 31, 2014		December 31, 2013		December 31, 2014		December 31, 2013
	(Dollars in millions)
Cash flow hedges:
Cross-currency swap contracts	$	8	$	112	$	24	$	—
Interest rate swap contracts		—		3		—		1
Fair value hedges:
Interest rate swap contracts		12		—		6		—
Total derivative financial instruments	$	20	$	115	$	30	$	1

Schedule of notional amounts of outstanding derivative financial instruments

	December 31, 2014		December 31, 2013
	(Dollars in millions)
Cash flow hedges:
Cross-currency swap contracts	$	2,418	$	2,418
Interest rate swaps		—		500
Fair value hedges:
Interest rate swaps		3,000		—
Total notional amount of derivative financial instruments	$	5,418	$	2,918