Description of Business and Significant Accounting Policies - Summary of Impact of Adoption of Topic 606 on Consolidated Statement of Operations and Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Item Effected [Line Items]
Accounts receivable, net		$ 1,850.7	$ 1,879.3
Inventory, net		1,583.1	1,662.4
Prepaid expenses and other		278.0	327.9
Current assets held for sale		3,541.3	6,370.4
Noncurrent assets held for sale			3,842.2
Other accrued liabilities		1,182.3	1,271.9
Current liabilities held for sale		650.4	1,661.3
Noncurrent liabilities held for sale			242.5
Retained deficit		(2,486.7)	4,611.2
Net sales	[1],[2]	8,630.9	9,552.0	$ 9,181.1
Cost of products sold		5,622.1	6,289.0	6,210.2
Selling, general and administrative expenses		2,434.8	2,705.6	2,610.6
Operating loss		(7,828.5)	385.5	298.1
Income tax benefit		(1,478.1)	(1,578.4)	57.1
Income (loss) from continuing operations		(6,789.6)	2,170.8	(38.3)
Loss from discontinued operations, net of tax		(128.3)	578.0	566.1
Net loss		(6,917.9)	2,748.8	$ 527.8
Accounting Standards Update 2014-09 [Member]
Item Effected [Line Items]
Accounts receivable, net		1,850.7	1,879.3		$ 1,979.6
Inventory, net		1,583.1
Prepaid expenses and other		278.0	327.9		342.5
Current assets held for sale		3,541.3	6,370.4		6,391.7
Noncurrent assets held for sale			3,842.2		3,876.0
Other accrued liabilities		1,182.3	1,271.9		1,386.8
Current liabilities held for sale		650.4	1,661.3		1,682.6
Noncurrent liabilities held for sale			242.5		276.3
Retained deficit		(2,486.7)	4,611.2		$ 4,611.2
Net sales		8,630.9
Cost of products sold		5,622.1
Selling, general and administrative expenses		2,434.8
Operating loss		(7,828.5)
Income tax benefit		(1,478.1)
Income (loss) from continuing operations		(6,789.6)
Loss from discontinued operations, net of tax		(128.3)
Net loss		(6,917.9)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Item Effected [Line Items]
Accounts receivable, net		(109.2)	100.3
Inventory, net		0.3
Prepaid expenses and other		(14.7)	14.6
Current assets held for sale		(36.7)	21.3
Noncurrent assets held for sale			33.8
Other accrued liabilities		(123.1)	114.9
Current liabilities held for sale		(36.7)	21.3
Noncurrent liabilities held for sale			$ 33.8
Retained deficit		(0.5)
Net sales		192.0
Cost of products sold		184.3
Selling, general and administrative expenses		8.4
Operating loss		(0.7)
Income tax benefit		(0.2)
Income (loss) from continuing operations		(0.5)
Net loss		(0.5)
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Item Effected [Line Items]
Accounts receivable, net		1,741.0
Inventory, net		1,583.4
Prepaid expenses and other		263.3
Current assets held for sale		3,504.6
Other accrued liabilities		1,059.1
Current liabilities held for sale		613.7
Retained deficit		(2,487.2)
Net sales		8,822.9
Cost of products sold		5,806.4
Selling, general and administrative expenses		2,443.2
Operating loss		(7,829.2)
Income tax benefit		(1,478.3)
Income (loss) from continuing operations		(6,790.1)
Loss from discontinued operations, net of tax		(128.3)
Net loss		$ (6,918.4)

[1] All intercompany transactions have been eliminated. Sales to Walmart Inc. and subsidiaries amounted to approximately XX%, 13.7% and 13.5% of consolidated net sales in 2018, 2017 and 2016, respectively, substantially across all segments.

[2] Geographic sales information is based on the region from which the products are shipped and invoiced. Long-lived assets by geography are not presented because it is impracticable to do so.