Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($)		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Unrealized Gains (Losses) on Fair Value Option Debt Attributable to Credit [Abstract]
Balance at beginning of period		$ (19,000,000)	$ 0
Cumulative effect adjustment to initially apply new accounting guidance for fair value option debt attributable to credit, net of tax	[1]			$ (19,000,000)	$ 0
Net (loss) arising during period, net of tax		(5,000,000)	0
Total other comprehensive loss for period		(5,000,000)	0
Balance at end of period		(24,000,000)	0
Cumulative effect adjustment to initially apply new accounting guidance for fair value option debt attributable to credit, tax		(11,000,000)	0
Net (loss) arising during period, tax		(3,000,000)	0
Unrealized gains (losses) on cash flow hedging instruments:
Balance at beginning of period		0	(15,000,000)
Net gains arising during period, net of tax		0	7,000,000
Reclassification adjustment for losses realized in net income, net of tax	[2]	0	1,000,000
Total other comprehensive income for period		0	8,000,000
Balance at end of period		0	(7,000,000)
Net gains arising during period, taxes		0	4,000,000
Reclassification adjustment for losses realized in net income, taxes		0	2,000,000
Pension and postretirement benefit plan liability:
Balance at beginning of period		24,000,000	29,000,000
Reclassification adjustment for losses realized in net income, net of tax	[3]	(1,000,000)	(1,000,000)
Total other comprehensive loss for period		(1,000,000)	(1,000,000)
Balance at end of period		23,000,000	28,000,000
Reclassification adjustment for losses realized in net income, tax		(1,000,000)	(1,000,000)
Total accumulated other comprehensive income (loss) at end of period		(1,000,000)	21,000,000	$ 24,000,000
As Previously Reported [Member]
Unrealized Gains (Losses) on Fair Value Option Debt Attributable to Credit [Abstract]
Balance at beginning of period		$ 0	$ 0

[1] For information on the adoption of new accounting guidance related to fair value option debt attributable to our credit spreads, see Note 13, "New Accounting Pronouncements."

[2] The amounts reclassified relate to currency swaps and are included as a component of interest expense in our consolidated statement of income (loss).

[3] The amounts reclassified are included as a component of salaries and employee benefits in our consolidated statement of income (loss).