Stockholder's Equity (Schedule of Accumulated Other Comprehensive Loss) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	$ (8,646)	$ (8,750)
Other comprehensive income (loss) before reclassifications	229	(17)
Amounts reclassified from accumulated other comprehensive income (loss)	417	382
Accumulated other comprehensive loss, ending balance	(8,000)	(8,385)
Cumulative Translation Adjustment [Member]
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	(167)	(244)
Other comprehensive income (loss), before reclassifications	(46)	(53)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Accumulated other comprehensive loss, ending balance	(213)	(297)
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	3	41
Other comprehensive income (loss), before reclassifications	(24)	15
Amounts reclassified from accumulated other comprehensive income (loss)	(16)	(38)
Accumulated other comprehensive loss, ending balance	(37)	18
Pension Plans [Member]
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (Loss), beginning balance	(8,686)	(8,276)
Other comprehensive income, before reclassifications	78	(444)
Amounts reclassified from accumulated other comprehensive income (loss)	591	442
Accumulated other comprehensive income (Loss), ending balance	(8,017)	(8,278)
Other Long-Term Employee Benefit Plans Defined Benefit [Member]
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (Loss), beginning balance	202	(274)
Other comprehensive income, before reclassifications	221	467
Amounts reclassified from accumulated other comprehensive income (loss)	(158)	(22)
Accumulated other comprehensive income (Loss), ending balance	265	171
Unrealized Gain (Loss) on Securities
Components of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	2	3
Other comprehensive income (loss), before reclassifications	0	(2)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Accumulated other comprehensive loss, ending balance	$ 2	$ 1