The following table presents changes in accumulated other comprehensive loss balances:



Three Months Ended March 31,	2018			2017
	(in millions)
Unrealized gains (losses) on investment securities:
Balance at beginning of period	$	(250	)	$	(461	)
Cumulative effective adjustment to initially apply new accounting guidance for equity investments which were previously classified as available-for-sale, net of tax of $2 million⁽¹⁾	4			—
Cumulative effective adjustment to initially apply new accounting guidance for stranded tax effects resulting from Tax Legislation⁽¹⁾	(53		)	—
Balance at beginning of period, adjusted	(299		)	(461		)
Other comprehensive income (loss) for period:
Net unrealized gains (losses) arising during period, net of tax of $(63) million and $64 million, respectively	(193		)	106
Reclassification adjustment for gains realized in net income (loss), net of tax of $(1) million and $(2) million, respectively⁽²⁾	(4		)	(3		)
Amortization of net unrealized losses on securities transferred from available-for-sale to held-to-maturity realized in net income (loss), net of tax of $1 million and $3 million, respectively⁽³⁾	2			4
Total other comprehensive income (loss) for period	(195		)	107
Balance at end of period	(494		)	(354		)
Unrealized gains (losses) on fair value option liabilities attributable to our own credit spread:
Balance at beginning of period	(19		)	—
Cumulative effective adjustment to initially apply new accounting guidance for stranded tax effects resulting from Tax Legislation⁽¹⁾	(4		)	—
Cumulative effect adjustment to initially apply new accounting guidance for financial liabilities measured under the fair value option, net of tax of $103 million⁽⁴⁾	—			174
Balance at beginning of period, adjusted	(23		)	174
Other comprehensive income (loss) for period:
Net unrealized gains (losses) arising during period, net of tax of $5 million and $(46) million, respectively	12			(79		)
Total other comprehensive income (loss) for period	12			(79		)
Balance at end of period	(11		)	95
Unrealized gains (losses) on derivatives designated as cash flow hedges:
Balance at beginning of period	(164		)	(157		)
Cumulative effective adjustment to initially apply new accounting guidance for stranded tax effects resulting from Tax Legislation⁽¹⁾	(35		)	—
Balance at beginning of period, adjusted	(199		)	(157		)
Other comprehensive income (loss) for period:
Net unrealized losses arising during period, net of tax is less then $(1) million and less than $(1) million, respectively	(1		)	(1		)
Reclassification adjustment for losses realized in net income (loss), net of tax of $1 million and $1 million, respectively⁽⁵⁾	3			2
Total other comprehensive income for period	2			1
Balance at end of period	(197		)	(156		)
Pension and postretirement benefit liability:
Balance at beginning of period	2			—
Cumulative effective adjustment to initially apply new accounting guidance for stranded tax effects resulting from Tax Legislation⁽¹⁾	1			—
Balance at beginning of period, adjusted	3			—
Other comprehensive income (loss) for period:
Change in unfunded pension and postretirement liability, net of tax of less then $1 million and less then $1 million, respectively	1			—
Total other comprehensive income for period	1			—
Balance at end of period	4			—
Total accumulated other comprehensive loss at end of period	$	(698	)	$	(415	)


⁽¹⁾	See Note 21, "New Accounting Pronouncements," for additional discussion.


⁽²⁾	Amount reclassified to net income (loss) is included in other securities gains, net in our consolidated statement of income (loss).

⁽³⁾

Amount amortized to net income (loss) is included in interest income in our consolidated statement of income (loss). During 2014, we transferred securities from available-for-sale to held-to-maturity. At the date of transfer, AOCI included net pretax unrealized losses of $234 million related to the transferred securities which are being amortized over the remaining contractual life of each security as an adjustment of yield in a manner consistent with the amortization of any premium or discount.


⁽⁴⁾	See Note 2, "Summary of Significant Accounting Polices and New Accounting Pronouncements," in our 2017 Form 10-K for additional discussion.


⁽⁵⁾	Amount reclassified to net income (loss) is included in interest income (expense) in our consolidated statement of income (loss).