Employee Benefit Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Feb. 28, 2014	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer contribution to tax-qualified defined benefit pension plans		$ 57
Number of days used to compute performance period average closing price of restricted stock units	20 days
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of pre-tax earnings paid for profit sharing plan		5.00%
Pre-tax profit excluding special items, profit sharing expense and share-based compensation program expense profit sharing threshold		$ 10
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of pre-tax earnings paid for profit sharing plan		20.00%
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation, award granted	0.3
Share-Based Compensation, vesting period	3 years
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation, award granted	0.5
Share-Based Compensation, vesting period	3 years
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation, vesting period	3 years
Share-Based Compensation, award granted	0.6
Share-Based Compensation, vesting date	Dec. 31, 2016