Derivative Instruments and Hedging Activities (Tables)

12 Months Ended

Dec. 31, 2013

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Fair Values of Derivative Instruments Recorded in Balance Sheet

The following table summarizes the fair values of derivative instruments recorded in our Consolidated Balance Sheet (in millions):

		December 31,
Derivatives Designated as Hedging Instruments	Balance Sheet Location	2013		2012
Electricity commodity derivatives	Current other assets	$	—	$	1
Foreign currency derivatives	Long-term other assets		2		—
Total derivative assets		$	2	$	1
Electricity commodity derivatives	Current accrued liabilities	$	3	$	5
Interest rate derivatives	Current accrued liabilities		28		—
Foreign currency derivatives	Current accrued liabilities		—		11
Interest rate derivatives	Long-term accrued liabilities		—		42
Total derivative liabilities		$	31	$	58

Impact of Changes in Fair Value of Interest Rate Swaps and Underlying Hedged Items on Results of Operations

The following table summarizes the fair value adjustments from active interest rate swaps and the underlying hedged items on our results of operations (in millions):

		Years Ended December 31,
Derivatives Designated as Fair Value Hedges	Statement of  Operations Classification	Gain (Loss) on Swap							Gain (Loss) on Fixed-Rate Debt
		2013		2012			2011		2013		2012		2011
Interest rate swaps	Interest expense	$	—	$	(1	)	$	35	$	—	$	1	$	(35	)

Impact of Periodic Settlements of Active Swap Agreements and Impact of Terminated Swap Agreements on Results of Operations

The following table summarizes the impact of periodic settlements of active swap agreements and the impact of terminated swap agreements on our results of operations (in millions):

	Years Ended December 31,
Decrease to Interest Expense Due to Hedge Accounting for Interest Rate Swaps	2013		2012		2011
Periodic settlements of active swap agreements(a)	$	—	$	8	$	23
Terminated swap agreements		20		22		12
	$	20	$	30	$	35

(a) These amounts represent the net of our periodic variable-rate interest obligations and the swap counterparties’ fixed-rate interest obligations. Our swaps provided that we received fixed interest rates ranging from 5.00% to 7.125% and paid floating interest rates based on spreads from three-month LIBOR ranging from (0.205)% to 5.53%. These settlements have decreased due to our election to terminate our interest rate swap portfolio with a notional amount of $1 billion in April 2012.