Accumulated other comprehensive income (loss), net of tax, consisted of:


(in $ millions)	Currency Translation Adjustments			Unrealized Gain (Loss) on Equity Investments			Unrealized Gain (Loss) on Cash Flow Hedges			Unrecognized Actuarial Gain (Loss) on Defined Benefit Plans			Accumulated Other Comprehensive Income (Loss)
Balance as of January 1, 2011		73			(4	)		(9	)		(69	)		(9	)
Activity during period, net of tax of $(2) ⁽¹⁾		(81	)		6			9			(101	)		(167	)

Balance as of December 31, 2011		(8	)		2			—			(170	)		(176	)
Activity during period, net of tax of $1 ⁽¹⁾		3			(3	)		—			(13	)		(13	)

Balance as of December 31, 2012		(5	)		(1	)		—			(183	)		(189	)
Activity during period, net of tax of $2 ⁽¹⁾		(5	)		9			(4	)		107			107

Balance as of December 31, 2013		(10	)		8			(4	)		(76	)		(82	)

(1)	The tax impact relates to unrecognized actuarial gain (loss) on defined benefit plans. For all other components of accumulated other comprehensive income (loss), the tax impact was $0 million for each of the years ended December 31, 2013, 2012 and 2011.