Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Contingency [Line Items]
Document Period End Date	Dec. 31, 2015
Deferred income tax provision (benefit) for the effect of changes in non-U.S. and U.S. state tax rates	$ 3	$ (13)	$ 7
Income tax payments, net of refunds	149	172	291
Deferred tax liabilities, other	2,300
Valuation allowance for deferred tax assets	430	415	413
Unrecognized Tax Benefits	(150)	(158)	(161)	$ (972)
Valuation allowance, deferred tax asset, increase (decrease)	15	2
Accrual for the payment of estimated interest and penalties associated with unrecognized tax benefits	34	41
Unrecognized tax benefits, decrease resulting from settlements with taxing authorities	2	0	26
Tax positions for which the ultimate benefits are highly certain, but for which there is uncertainty about the timing of such benefits	39
Income tax provision (benefit) related to special items	(121)	(453)	(869)
Income tax provision excluding the impact special items	$ 687	$ 659	$ 497
Income tax provision (benefit) excluding the impact of special items as a percentage of pre-tax earnings before equity earnings	33.00%	31.00%	26.00%
Undistributed earnings of foreign subsidiaries	$ 5,700	$ 5,200	$ 5,100
Income tax provision (benefit)	466	123	(498)
FY 2013 [Member]
Income Tax Contingency [Line Items]
Income tax provision (benefit)		32
Domestic Tax Authority [Member]
Income Tax Contingency [Line Items]
Unrecognized tax benefits, decrease resulting from settlements with taxing authorities		844
Two Thousand And Six Financing Entities [Member]
Income Tax Contingency [Line Items]
Deferred tax liabilities, other	1,400
Two Thousand Seven Monetized Notes [Member]
Income Tax Contingency [Line Items]
Deferred tax liabilities, other	840
Settlement with Taxing Authority [Member]
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	$ (1)	$ (1)	$ (1)