Stockholder's Equity (Schedule of Accumulated Other Comprehensive Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	$ (8,707)	$ (5,441)
Other comprehensive loss before reclassifications	(1,135)	(47)
Amounts reclassified from accumulated other comprehensive loss	120	86
Accumulated other comprehensive loss, ending balance	(9,722)	(5,402)
Cumulative Translation Adjustment [Member]
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	(1,016)	(140)
Other comprehensive loss, before reclassifications, CTA	(1,189)	(72)
Amounts reclassified from accumulated other comprehensive loss	0	0
Accumulated other comprehensive loss, ending balance	(2,205)	(212)
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	(6)	(48)
Other comprehensive (loss) income, before reclassifications, cash flow hedges	(16)	24
Amounts reclassified from accumulated other comprehensive loss, cash flow hedges	4	11
Accumulated other comprehensive loss, ending balance	(18)	(13)
Pension Plans [Member]
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	(7,949)	(5,749)
Other comprehensive income, before reclassifications, pension and other benefit plans	70	1
Amounts reclassified from accumulated other comprehensive loss, pension and other benefit plans	137	99
Accumulated other comprehensive loss, ending balance	(7,742)	(5,649)
Other Long-Term Employee Benefit Plans [Member]
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	262	494
Other comprehensive income, before reclassifications, pension and other benefit plans	0	0
Amounts reclassified from accumulated other comprehensive loss, pension and other benefit plans	(21)	(24)
Accumulated other comprehensive loss, ending balance	241	470
Unrealized Gain on Securities
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	2	2
Other comprehensive income (loss), before reclassifications, securities	0	0
Amounts reclassified from accumulated other comprehensive loss, securities	0	0
Accumulated other comprehensive loss, ending balance	$ 2	$ 2