Stockholder's Equity (Schedule of Accumulated Other Comprehensive Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
AOCI [Roll Forward]
Accumulated other comprehensive loss, beginning balance	$ (5,441)	$ (8,646)
Other comprehensive income (loss) before reclassifications	(47)	(165)
Amounts reclassified from accumulated other comprehensive loss	86	149
Accumulated other comprehensive loss, ending balance	(5,402)	(8,662)
Cumulative Translation Adjustment [Member]
AOCI [Roll Forward]
Accumulated other comprehensive loss, beginning balance	(140)	(167)
Other comprehensive income (loss), before reclassifications, CTA	(72)	(209)
Amounts reclassified from accumulated other comprehensive loss	0	0
Accumulated other comprehensive loss, ending balance	(212)	(376)
Net Revaluation and Clearance of Cash Flow Hedges to Earnings
AOCI [Roll Forward]
Accumulated other comprehensive loss, beginning balance	(48)	3
Other comprehensive income (loss), before reclassifications, cash flow hedges	24	(9)
Amounts reclassified from accumulated other comprehensive loss, cash flow hedges	11	(6)
Accumulated other comprehensive loss, ending balance	(13)	(12)
Pension Plans [Member]
AOCI [Roll Forward]
Accumulated other comprehensive loss, beginning balance	(5,749)	(8,686)
Other comprehensive income, before reclassifications, pension and other benefit plans	1	42
Amounts reclassified from accumulated other comprehensive loss, pension and other benefit plans	99	269
Accumulated other comprehensive loss, ending balance	(5,649)	(8,375)
Other Long-Term Employee Benefit Plans [Member]
AOCI [Roll Forward]
Accumulated other comprehensive loss, beginning balance	494	202
Other comprehensive income, before reclassifications, pension and other benefit plans	0	11
Amounts reclassified from accumulated other comprehensive loss, pension and other benefit plans	(24)	(112)
Accumulated other comprehensive loss, ending balance	470	101
Unrealized Gain (Loss) on Securities
AOCI [Roll Forward]
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	(2)
Accumulated other comprehensive loss, ending balance	$ 2	$ 0