Stockholders' Equity Stockholders' Equity (Reclassifications out of accumulated other Comprehensive Income / (Loss)) (Details) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income Tax Expense (Benefit)		$ 744	$ 696	$ 1,168
Other income, net		708	697	1,277
Income from continuing operations after income taxes		2,521	1,895	3,145
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		335	297	309
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income Tax Expense (Benefit)	[1]	(7)	(5)	(6)
Pension Plan [Member] | Prior service (benefit) cost
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[2]	(6)	(9)	2
Pension Plan [Member] | Actuarial losses
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[2]	822	768	601
Pension Plan [Member] | Curtailment loss (gain)
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[2]	40	(6)	4
Pension Plan [Member] | Settlement loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[2]	62	76	7
Pension Plan [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		918	829	614
Reclassification from AOCI, Current Period, Tax	[1]	(324)	(294)	(213)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		594	535	401
Other Post Employment Benefit Plans [Member] | Prior service (benefit) cost
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[2]	(134)	(182)	(214)
Other Post Employment Benefit Plans [Member] | Actuarial losses
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[2]	78	78	57
Other Post Employment Benefit Plans [Member] | Curtailment loss (gain)
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[2]	(392)	(274)	0
Other Post Employment Benefit Plans [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		(448)	(378)	(157)
Reclassification from AOCI, Current Period, Tax	[1]	150	135	56
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(298)	(243)	(101)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		335	297	309
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net Sales and Cost of Goods Sold	[3]	18	12	15
Income from continuing operations after income taxes		11	7	9
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income Tax Expense (Benefit)	[1]	0	0	0
Other income, net	[4]	28	(2)	0
Income from continuing operations after income taxes		$ 28	$ (2)	$ 0

[1] 2. Provision for income taxes from continuing operations

[2] 3. These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost of the company's pension and other benefit plans. See Note 17 for additional information.

[3] 1. Net sales and cost of goods sold

[4] 4. Other income, net