Accumulated Other Comprehensive Income - Reclassifications Out of AOCI (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Comprehensive Income Loss [Line Items]
Amount Reclassified from Accumulated Other Comprehensive Income	$ 8	$ 11
Total Before Income Taxes [Member]
Accumulated Comprehensive Income Loss [Line Items]
Amount Reclassified from Accumulated Other Comprehensive Income	14	16
Affected Line Item in the Statement Where Net Income is Presented	Income (loss) from continuing operations before income taxes	Income (loss) from continuing operations before income taxes
Net of Income Taxes [Member]
Accumulated Comprehensive Income Loss [Line Items]
Amount Reclassified from Accumulated Other Comprehensive Income	8	10
Affected Line Item in the Statement Where Net Income is Presented	Income (loss) from continuing operations	Income (loss) from continuing operations
Income Taxes [Member]
Accumulated Comprehensive Income Loss [Line Items]
Amount Reclassified from Accumulated Other Comprehensive Income	6	6
Affected Line Item in the Statement Where Net Income is Presented	Income taxes	Income taxes
Interest Rate [Member] | Interest Income [Member]
Accumulated Comprehensive Income Loss [Line Items]
Amount Reclassified from Accumulated Other Comprehensive Income	15	22
Affected Line Item in the Statement Where Net Income is Presented	Interest income - Loans	Interest income - Loans
Interest Rate [Member] | Interest Expense [Member]
Accumulated Comprehensive Income Loss [Line Items]
Amount Reclassified from Accumulated Other Comprehensive Income	(1)	(3)
Affected Line Item in the Statement Where Net Income is Presented	Interest expense - Long term debt	Interest expense - Long term debt
Foreign Exchange [Member] | Other Income [Member]
Accumulated Comprehensive Income Loss [Line Items]
Amount Reclassified from Accumulated Other Comprehensive Income		(3)
Affected Line Item in the Statement Where Net Income is Presented		Other income
Foreign Currency Translation Adjustments [Member] | Total Before Income Taxes [Member]
Accumulated Comprehensive Income Loss [Line Items]
Amount Reclassified from Accumulated Other Comprehensive Income	3	7
Affected Line Item in the Statement Where Net Income is Presented	Income (loss) from continuing operations before income taxes	Income (loss) from continuing operations before income taxes
Foreign Currency Translation Adjustments [Member] | Net of Income Taxes [Member]
Accumulated Comprehensive Income Loss [Line Items]
Amount Reclassified from Accumulated Other Comprehensive Income	2	4
Affected Line Item in the Statement Where Net Income is Presented	Income (loss) from continuing operations	Income (loss) from continuing operations
Foreign Currency Translation Adjustments [Member] | Income Taxes [Member]
Accumulated Comprehensive Income Loss [Line Items]
Amount Reclassified from Accumulated Other Comprehensive Income	1	3
Affected Line Item in the Statement Where Net Income is Presented	Income taxes	Income taxes
Foreign Currency Translation Adjustments [Member] | Corporate Services Income [Member]
Accumulated Comprehensive Income Loss [Line Items]
Amount Reclassified from Accumulated Other Comprehensive Income	3	7
Affected Line Item in the Statement Where Net Income is Presented	Corporate services income	Corporate services income
Pension And Other Postretirement Benefit Plan Cost [Member] | Total Before Income Taxes [Member]
Accumulated Comprehensive Income Loss [Line Items]
Amount Reclassified from Accumulated Other Comprehensive Income	(4)	(5)
Affected Line Item in the Statement Where Net Income is Presented	Income (loss) from continuing operations before income taxes	Income (loss) from continuing operations before income taxes
Pension And Other Postretirement Benefit Plan Cost [Member] | Income Tax [Member]
Accumulated Comprehensive Income Loss [Line Items]
Amount Reclassified from Accumulated Other Comprehensive Income	(2)	(2)
Affected Line Item in the Statement Where Net Income is Presented	Income taxes	Income taxes
Pension And Other Postretirement Benefit Plan Cost [Member] | Net of Income Taxes [Member]
Accumulated Comprehensive Income Loss [Line Items]
Amount Reclassified from Accumulated Other Comprehensive Income	(2)	(3)
Affected Line Item in the Statement Where Net Income is Presented	Income (loss) from continuing operations	Income (loss) from continuing operations
Pension And Other Postretirement Benefit Plan Cost [Member] | Amortization of Losses [Member]
Accumulated Comprehensive Income Loss [Line Items]
Amount Reclassified from Accumulated Other Comprehensive Income	$ (4)	$ (5)
Affected Line Item in the Statement Where Net Income is Presented	Personnel expense	Personnel expense