Stockholder's Equity (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2016		Jun. 30, 2015	Jun. 30, 2016		Jun. 30, 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				(1,645)		(978)
Amounts reclassified from accumulated other comprehensive loss				284		239
Accumulated other comprehensive loss, ending balance	$ (10,757)		$ (9,295)	(10,757)		(9,295)
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				73		(992)
Amounts reclassified from accumulated other comprehensive loss				0		0
Accumulated other comprehensive loss, ending balance	(2,260)		(1,911)	(2,260)		(1,911)
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				23		(11)
Amounts reclassified from accumulated other comprehensive loss, cash flow hedges				11		7
Accumulated other comprehensive loss, ending balance	10		(10)	10		(10)
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				(1,564)		25
Amounts reclassified from accumulated other comprehensive loss, pension and other benefit plans				309		274
Accumulated other comprehensive loss, ending balance	(8,298)		(7,596)	(8,298)		(7,596)
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				(170)		0
Amounts reclassified from accumulated other comprehensive loss, pension and other benefit plans				(49)		(42)
Accumulated other comprehensive loss, ending balance	(197)		220	(197)		220
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	2	[1]	0	(7)	[1]	0
Amounts reclassified from accumulated other comprehensive loss, securities				13		0
Accumulated other comprehensive loss, ending balance	$ (12)		$ 2	$ (12)		$ 2

[1] The unrealized gain (loss) on securities during the three and six months ended June 30, 2016 is due to the re-measurement of USD denominated marketable securities held by certain foreign entities at June 30, 2016 with a corresponding offset to cumulative translation adjustment.