Stockholders' Equity (Schedule of Accumulated Other Comprehensive Loss) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
AOCI [Roll Forward]
Accumulated other comprehensive loss, beginning balance	$ (8,646)	$ (8,750)	$ (5,790)
Other comprehensive income (loss) before reclassifications	2,656	(417)	(3,395)
Amounts reclassified from accumulated other comprehensive income (loss)	549	521	435
Accumulated other comprehensive loss, ending balance	(5,441)	(8,646)	(8,750)
Cumulative Translation Adjustment [Member]
AOCI [Roll Forward]
Accumulated other comprehensive loss, beginning balance	(167)	(244)	213
Other comprehensive income (loss) before reclassifications, CTA	27	77	(457)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0
Accumulated other comprehensive loss, ending balance	(140)	(167)	(244)
Net Revaluation and Clearance of Cash Flow Hedges to Earnings [Member]
AOCI [Roll Forward]
Accumulated other comprehensive loss, beginning balance	3	41	(31)
Other comprehensive income (loss) before reclassifications, cash flow hedges	(36)	(1)	12
Amounts reclassified from accumulated other comprehensive income (loss), cash flow hedges	(15)	(37)	60
Accumulated other comprehensive loss, ending balance	(48)	3	41
Pension Plans, Defined Benefit [Member]
AOCI [Roll Forward]
Accumulated other comprehensive loss, beginning balance	(8,686)	(8,276)	(6,032)
Other comprehensive income (loss) before reclassifications, pension and other benefit plans	2,197	(1,006)	(2,658)
Amounts reclassified from accumulated other comprehensive income (loss), pension and other benefit plans	740	596	414
Accumulated other comprehensive loss, ending balance	(5,749)	(8,686)	(8,276)
Other Long-Term Employee Benefit Plans [Member]
AOCI [Roll Forward]
Accumulated other comprehensive loss, beginning balance	202	(274)	58
Other comprehensive income (loss) before reclassifications, pension and other benefit plans	468	514	(293)
Amounts reclassified from accumulated other comprehensive income (loss), pension and other benefit plans	(176)	(38)	(39)
Accumulated other comprehensive loss, ending balance	494	202	(274)
Unrealized Gain (Loss) on Securities [Member]
AOCI [Roll Forward]
Accumulated other comprehensive loss, beginning balance	2	3	2
Other comprehensive income (loss) before reclassifications, securities	0	(1)	1
Amounts reclassified from accumulated other comprehensive income (loss), securities	0	0	0
Accumulated other comprehensive loss, ending balance	$ 2	$ 2	$ 3