Stockholder's Equity (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016		Mar. 31, 2015
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	$ (9,396)		$ (8,556)
Other comprehensive loss before reclassifications	(670)		(1,135)
Amounts reclassified from accumulated other comprehensive loss	115		120
Accumulated other comprehensive loss, ending balance	(9,951)		(9,571)
Cumulative Translation Adjustment [Member]
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	(2,333)		(919)
Other comprehensive income (loss), before reclassifications, CTA	170		(1,189)
Amounts reclassified from accumulated other comprehensive loss	0		0
Accumulated other comprehensive loss, ending balance	(2,163)		(2,108)
Net Revaluation and Clearance of Cash Flow Hedges to Earnings
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	(24)		(6)
Other comprehensive income (loss), before reclassifications, cash flow hedges	10		(16)
Amounts reclassified from accumulated other comprehensive loss, cash flow hedges	7		4
Accumulated other comprehensive loss, ending balance	(7)		(18)
Pension Plans [Member]
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	(7,043)		(7,895)
Other comprehensive (loss) income, before reclassifications, pension and other benefit plans	(762)		70
Amounts reclassified from accumulated other comprehensive loss, pension and other benefit plans	143		137
Accumulated other comprehensive loss, ending balance	(7,662)		(7,688)
Other Long-Term Employee Benefit Plans [Member]
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	22		262
Other comprehensive (loss) income, before reclassifications, pension and other benefit plans	(79)		0
Amounts reclassified from accumulated other comprehensive loss, pension and other benefit plans	(36)		(21)
Accumulated other comprehensive loss, ending balance	(93)		241
Unrealized (Loss) Gain on Securities
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	(18)		2
Other comprehensive loss, before reclassifications, securities	(9)	[1]	0
Amounts reclassified from accumulated other comprehensive loss, securities	1		0
Accumulated other comprehensive loss, ending balance	$ (26)		$ 2

[1] The unrealized loss on securities during the three months ended March 31, 2016 is due to the re-measurement of USD denominated marketable securities held by certain foreign entities at March 31, 2016 with a corresponding offset to cumulative translation adjustment.