Subsequent events- Additional Information (Detail) (Subsequent Event Member, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Subsequent Events [Line Items]
Maximum Expected Goodwill Impairment Loss	$ 220
Minimum Expected Goodwill Impairment Loss	160
Discontinued Operation Maximum Aggregate Gain Loss	194
Discontinued Operation Minimum Aggregate Gain Loss	134
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	26
Severance Costs	32
Other Restructuring Costs	22
Restructuring Charges	54
Bpna [Member]
Subsequent Events [Line Items]
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries	250
PNA Holding Co.
Subsequent Events [Line Items]
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries	$ 100