Schedule of Share-Based Compensation Plan Cost (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	[1]	$ 70	$ 58	$ 114
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	[1]	58	52	104
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	[1]	11	$ 6	$ 10
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	[1]	$ 1

[1] All compensation cost is recorded to Salaries and related costs, with the exception of $3 million in 2014 that was recorded in integration-related costs as a component of special items.