Shareholders' Equity (Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (2,775)		$ (2,312)	$ (1,436)
OCL before reclassifications	1,354
Amounts reclassified from AOCL	236
Other comprehensive loss, net amount	1,590		(463)	(876)
Ending balance	(1,185)		(2,775)	(2,312)
Costs and Expenses	(27,533)		(30,680)	(28,851)
Income Tax Expense (Benefit)	(1,121)		(873)	(1,166)
Net Income (Loss) Attributable to Parent	2,357		(332)	2,526
Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	6		26	85
OCL before reclassifications	11
Amounts reclassified from AOCL	(8)
Other comprehensive loss, net amount	3		(20)	(59)
Ending balance	9		6	26
Unrealized Gains (Losses) On Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	7		3	4
OCL before reclassifications	8
Amounts reclassified from AOCL	0
Other comprehensive loss, net amount	8		4	(1)
Ending balance	15		7	3
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	1,092		821	892
OCL before reclassifications	(118)
Amounts reclassified from AOCL	0
Other comprehensive loss, net amount	(118)		271	(71)
Ending balance	974		1,092	821
Changes In Retirement Plans' Funded Status
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(3,880)		(3,162)	(2,417)
OCL before reclassifications	1,453
Amounts reclassified from AOCL	244
Other comprehensive loss, net amount	1,697		(718)	(745)
Ending balance	(2,183)		(3,880)	(3,162)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Net Income (Loss) Attributable to Parent	236
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Costs and Expenses	(12)
Income Tax Expense (Benefit)	4
Net Income (Loss) Attributable to Parent	(8)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Changes In Retirement Plans' Funded Status
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Income Tax Expense (Benefit)	(131)
Net Income (Loss) Attributable to Parent	244
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	(435)	[1]
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax	$ (60)	[1]

[1] These AOCL components are included in our net periodic pension and other post-retirement benefit cost. See Note P for additional details.