Shareholders' Equity Shareholders' Equity (Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (2,312)	$ (1,436)	$ (1,207)
Other comprehensive loss	(463)	(876)	(229)
Ending balance	(2,775)	(2,312)	(1,436)
Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	26	85	19
Other comprehensive loss	(20)	(59)	66
Ending balance	6	26	85
Unrealized Gains (Losses) On Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	3	4	3
Other comprehensive loss	4	(1)	1
Ending balance	7	3	4
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	821	892	613
Other comprehensive loss	271	(71)	279
Ending balance	1,092	821	892
Changes In Retirement Plans' Funded Status
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(3,162)	(2,417)	(1,842)
Other comprehensive loss	(718)	(745)	(575)
Ending balance	$ (3,880)	$ (3,162)	$ (2,417)