Stockholder's Equity (Schedule of Accumulated Other Comprehensive Loss) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income, beginning balance	$ (5,441)	$ (8,646)
Other comprehensive income (loss) before reclassifications	(592)	229
Amounts reclassified from accumulated other comprehensive loss	244	417
Accumulated other comprehensive (loss) income, ending balance	(5,789)	(8,000)
Cumulative Translation Adjustment [Member]
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income, beginning balance	(140)	(167)
Other comprehensive income (loss), before reclassifications, CTA	(559)	(46)
Amounts reclassified from accumulated other comprehensive loss	0	0
Accumulated other comprehensive (loss) income, ending balance	(699)	(213)
Net Revaluation and Clearance of Cash Flow Hedges to Earnings
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income, beginning balance	(48)	3
Other comprehensive income (loss), before reclassifications, cash flow hedges	15	(24)
Amounts reclassified from accumulated other comprehensive loss, cash flow hedges	18	(16)
Accumulated other comprehensive (loss) income, ending balance	(15)	(37)
Pension Plans [Member]
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income, beginning balance	(5,749)	(8,686)
Other comprehensive income, before reclassifications, pension and other benefit plans	(74)	78
Amounts reclassified from accumulated other comprehensive loss, pension and other benefit plans	302	591
Accumulated other comprehensive (loss) income, ending balance	(5,521)	(8,017)
Other Long-Term Employee Benefit Plans [Member]
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income, beginning balance	494	202
Other comprehensive income, before reclassifications, pension and other benefit plans	(26)	221
Amounts reclassified from accumulated other comprehensive loss, pension and other benefit plans	(76)	(158)
Accumulated other comprehensive (loss) income, ending balance	444	265
Unrealized Gain on Securities
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income, 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) income, ending balance	$ 2	$ 2