Components of Accumulated Other Comprehensive Earnings / (Losses) (Detail) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balances		$ (9,986)	$ (7,318)	$ (7,318)
Total other comprehensive earnings / (losses)		618	(1,915)	$ (2,694)
Cost of sales		(3,920)	(4,821)
Tax (expense) / benefit on reclassifications		(49)	(113)
Interest rate contracts		(244)	(386)
Other comprehensive earnings / (losses)		605	(1,890)
Less: portion attributable to noncontrolling interests		13	(25)
Ending balances		(9,381)	(9,208)	$ (9,986)	$ (7,318)
Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balances		(8,006)	(5,042)	(5,042)
Translation of international operations	[1]	792	(2,352)
Pension and other benefits		(30)	131
Derivatives accounted for as net investment hedges		(274)	525
Noncontrolling interests		13	(25)
Tax (expense) / benefit		100	(192)
Other comprehensive earnings / (losses)		601	(1,913)
Less: portion attributable to noncontrolling interests		13	(25)
Ending balances		(7,418)	(6,930)	(8,006)	(5,042)
Pension and other benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balances		(1,934)	(2,274)	(2,274)
Other comprehensive earnings / (losses)		24	42
Ending balances		(1,910)	(2,232)	(1,934)	(2,274)
Derivatives accounted for as hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balances		(46)	(2)	(2)
Net derivative gains / (losses)		(90)	(56)
Tax (expense) / benefit on net derivative gain / (loss)		24	30
Other comprehensive earnings / (losses)		(7)	(44)
Ending balances		(53)	(46)	$ (46)	$ (2)
Reclassification out of Accumulated Other Comprehensive Income | Pension and other benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of experience losses and prior service costs	[2]	29	52
Settlement losses	[2]	4	3
Tax (expense) / benefit on reclassifications	[3]	(9)	(13)
Reclassification out of Accumulated Other Comprehensive Income | Derivatives accounted for as hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Tax (expense) / benefit on reclassifications	[3]	(36)	(14)
Reclassification out of Accumulated Other Comprehensive Income | Derivatives accounted for as hedges | Currency exchange contracts | Forecasted transactions
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of sales	[4]	(6)	(50)
Reclassification out of Accumulated Other Comprehensive Income | Derivatives accounted for as hedges | Commodity contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of sales	[4]	5	5
Reclassification out of Accumulated Other Comprehensive Income | Derivatives accounted for as hedges | Interest rate contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest rate contracts	[5]	$ 96	$ 41

[1] Includes $57 million of historical cumulative transaction adjustments reclassified to net earnings within the gain on equity method investment exchange.

[2] These reclassified gains or losses are included in the components of net periodic benefit costs disclosed in Note 9, Benefit Plans, and equity method investment net earnings.

[3] Taxes related to reclassified gains or losses are recorded within the provision for income taxes.

[4] These reclassified gains or losses are recorded within cost of sales.

[5] These reclassified gains or losses are recorded within interest and other expense, net.