Debt And Financing Arrangements (Narrative) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended	6 Months Ended		12 Months Ended						1 Months Ended	6 Months Ended			1 Months Ended	3 Months Ended			1 Months Ended	6 Months Ended		6 Months Ended	1 Months Ended	6 Months Ended				6 Months Ended				1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended		12 Months Ended				6 Months Ended							1 Months Ended	6 Months Ended		6 Months Ended					6 Months Ended					6 Months Ended					6 Months Ended					6 Months Ended					6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010	Oct. 31, 2012	Sep. 26, 2011	Mar. 31, 2011	Feb. 28, 2011 Floating rate notes due in two thousand twelve [Member]	Dec. 31, 2012 Floating rate notes due in two thousand twelve [Member]	Jun. 30, 2011 Floating rate notes due in two thousand twelve [Member]	Feb. 11, 2011 Floating rate notes due in two thousand twelve [Member]	Mar. 31, 2011 Debentures four point seven percent due in two thousand forty one [Member]	Mar. 31, 2011 Debentures four point seven percent due in two thousand forty one [Member]	Mar. 30, 2011 Debentures four point seven percent due in two thousand forty one [Member]	Jun. 30, 2008 Debentures four point seven percent due in two thousand forty one [Member]	Mar. 31, 2011 Debentures four point four seven nine percent due in two thousand twenty one [Member]	Dec. 31, 2012 Debentures four point four seven nine percent due in two thousand twenty one [Member]	Mar. 30, 2011 Debentures four point four seven nine percent due in two thousand twenty one [Member]	Dec. 31, 2012 Debentures five point four five percent due in two thousand eighteen [Member]	Mar. 31, 2011 Debentures five point seven six five percent due in two thousand forty one [Member]	Dec. 31, 2012 Debentures five point seven six five percent due in two thousand forty one [Member]	Oct. 31, 2012 Debentures five point seven six five percent due in two thousand forty one [Member]	Jun. 30, 2012 Debentures five point seven six five percent due in two thousand forty one [Member]	Mar. 30, 2011 Debentures five point seven six five percent due in two thousand forty one [Member]	Dec. 31, 2012 Debentures five point three seven five percent due in two thousand thirty five [Member}	Dec. 31, 2012 Debentures five point nine three five percent due in two thousand thirty two [Member]	Oct. 31, 2012 Debentures five point nine three five percent due in two thousand thirty two [Member]	Jun. 30, 2012 Debentures five point nine three five percent due in two thousand thirty two [Member]	Oct. 31, 2012 Debentures four point zero one six percent due in two thousand forty three [Member]	Dec. 31, 2012 Debentures four point zero one six percent due in two thousand forty three [Member]	Feb. 28, 2007 Convertible senior notes point eight seven five percent due two thousand fourteen [Member]	Dec. 31, 2012 Convertible senior notes point eight seven five percent due two thousand fourteen [Member]	Dec. 31, 2011 Convertible senior notes point eight seven five percent due two thousand fourteen [Member]	Jun. 30, 2012 Convertible senior notes point eight seven five percent due two thousand fourteen [Member]	Jun. 30, 2011 Convertible senior notes point eight seven five percent due two thousand fourteen [Member]	Jun. 30, 2010 Convertible senior notes point eight seven five percent due two thousand fourteen [Member]	Jun. 30, 2007 Convertible senior notes point eight seven five percent due two thousand fourteen [Member]	Dec. 31, 2012 Debentures eight point three seven five percent due in two thousand seventeen [ Member]	Dec. 31, 2012 Debentures seven point one two five percent due in two thousand thirteen [Member]	Dec. 31, 2012 Debentures seven point five percent due in two thousand twenty seven [Member]	Oct. 31, 2012 Debentures seven point five percent due in two thousand twenty seven [Member]	Jun. 30, 2012 Debentures seven point five percent due in two thousand twenty seven [Member]	Sep. 26, 2011 Debentures seven point five percent due in two thousand twenty seven [Member]	Jun. 30, 2011 Debentures seven point five percent due in two thousand twenty seven [Member]	Sep. 30, 2011 Debentures four point five three five percent due in two thousand forty two [Member]	Dec. 31, 2012 Debentures four point five three five percent due in two thousand forty two [Member]	Sep. 26, 2011 Debentures four point five three five percent due in two thousand forty two [Member]	Dec. 31, 2012 Debentures seven percent due in two thousand thirty one [Member]	Oct. 31, 2012 Debentures seven percent due in two thousand thirty one [Member]	Jun. 30, 2012 Debentures seven percent due in two thousand thirty one [Member]	Sep. 26, 2011 Debentures seven percent due in two thousand thirty one [Member]	Jun. 30, 2011 Debentures seven percent due in two thousand thirty one [Member]	Dec. 31, 2012 Debentures six point six two five percent due in two thousand twenty nine [Member]	Oct. 31, 2012 Debentures six point six two five percent due in two thousand twenty nine [Member]	Jun. 30, 2012 Debentures six point six two five percent due in two thousand twenty nine [Member]	Sep. 26, 2011 Debentures six point six two five percent due in two thousand twenty nine [Member]	Jun. 30, 2011 Debentures six point six two five percent due in two thousand twenty nine [Member]	Dec. 31, 2012 Debentures six point nine five due in two thousand ninety seven [Member]	Oct. 31, 2012 Debentures six point nine five due in two thousand ninety seven [Member]	Jun. 30, 2012 Debentures six point nine five due in two thousand ninety seven [Member]	Sep. 26, 2011 Debentures six point nine five due in two thousand ninety seven [Member]	Jun. 30, 2011 Debentures six point nine five due in two thousand ninety seven [Member]	Dec. 31, 2012 Debentures six point four five percent due in two thousand thirty eight [Member]	Oct. 31, 2012 Debentures six point four five percent due in two thousand thirty eight [Member]	Jun. 30, 2012 Debentures six point four five percent due in two thousand thirty eight [Member]	Sep. 26, 2011 Debentures six point four five percent due in two thousand thirty eight [Member]	Jun. 30, 2011 Debentures six point four five percent due in two thousand thirty eight [Member]	Dec. 31, 2012 Debentures six point seven five percent due in two thousand twenty seven [Member]	Oct. 31, 2012 Debentures six point seven five percent due in two thousand twenty seven [Member]	Jun. 30, 2012 Debentures six point seven five percent due in two thousand twenty seven [Member]	Sep. 26, 2011 Debentures six point seven five percent due in two thousand twenty seven [Member]	Jun. 30, 2011 Debentures six point seven five percent due in two thousand twenty seven [Member]	Dec. 31, 2012 Debentures eight point one two five percent due in two thousand twelve [Member]	Dec. 31, 2012 Lines of credit [Member]	Jun. 30, 2012 Lines of credit [Member]	Jun. 30, 2011 Lines of credit [Member]	Dec. 31, 2012 Commercial Paper [Member]
Debt And Financing Arrangements [Line Items]
Remarketed debt face amount underlying the units																					$ 750,000,000						$ 1,000,000,000
Stated interest rate for debt remarketed into two tranches (as a percent)																	4.70%
Number of tranches debt was remarketed into															two
Debt instrument face amount				1,750,000,000						1,750,000,000		1,400,000,000	1,500,000,000					1,750,000,000		750,000,000		700,000,000		596,000,000		1,000,000,000		600,000,000	420,000,000		500,000,000	570,000,000	570,000,000		1,150,000,000						295,000,000	243,000,000	187,000,000		222,000,000		282,000,000		528,000,000	528,000,000	185,000,000		194,000,000		246,000,000	182,000,000		197,000,000		298,000,000	172,000,000		176,000,000		250,000,000	154,000,000		158,000,000		215,000,000	124,000,000		141,000,000		200,000,000	103,000,000
Interest rate stated percentage				4.70%																4.479%	4.479%	5.45%		5.765%	5.765%		5.765%	5.375%	5.935%	5.935%		4.016%	4.016%	0.875%	0.875%						8.375%	7.125%	7.50%	7.50%		7.50%			4.535%	4.535%	7.00%	7.00%		7.00%		6.625%	6.625%		6.625%		6.95%	6.95%		6.95%		6.45%	6.45%		6.45%		6.75%	6.75%		6.75%		8.125%
Debt instrument, maturity year												2012							2021	2021		2018	2041	2041				2035	2032			2043	2043	2014	2014						2017	2013	2027						2042		2031					2029					2097					2038					2027					2012
Proceeds from long-term debt borrowings			106,000,000	91,000,000	97,000,000	1,564,000,000	27,000,000				1,500,000,000																							1,150,000,000
Debt face amount exchanged for new debentures								568,000,000	404,000,000								1,750,000,000
Debt premium			197,000,000	32,000,000	44,000,000	21,000,000	71,000,000																									196,000,000																32,000,000
Charges from early extinguishment of debt		15,000,000	5,000,000	12,000,000	12,000,000	15,000,000	75,000,000									8,000,000
Shares issued related to equity unit conversion (in shares)	44
Cash received for shares issued related to equity unit conversion	1,750,000,000					1,750,000,000
Debt instrument, maturity date											Aug. 13, 2012																								Jan. 15, 2014
Debt Instrument, floating interest rate											three-month LIBOR
Debt instrument, basis spread on floating interest rate														0.16%
Convertible debt initial conversion units																																			22.8423
Principal amount of debt used for conversion ratio																																			1,000
Convertible debt conversion price (in dollars per share)																																			$ 43.78
Minimum number of days within a specified consecutive trading day period in which the closing price of the entity's common stock must exceed the conversion price by a specified percentage rate for the notes to be redeemable (in days)																																			20 days
Number of consecutive trading days during which the closing price of the entity's common stock must exceed the conversion price by a specified rate for a minimum amount of days in order for the notes to be redeemable (in days)																																			30 days
Percentage of the closing sales price of the entity's common stock that the conversion price must exceed in order for the notes to be convertible (as a percent)																																			140.00%
Maximum amount of cash that holder would receive upon conversion																																			1,000
Number of consecutive business days immediately after any specified consecutive trading day period																																			5 days
Number of consecutive trading days immediately prior to specified number of consecutive business days																																			5 days
Maximum percentage rate of the average product of the closing price of the Company's common stock and the average conversion rate of the debt instrument that the average trading price must be equal to or less than in order for the debt instruments to be convertible.																																			98.00%
Percentage of principal amount plus accrued and unpaid interest at which holders may require the entity to repurchase the debt instrument																																			100.00%
Proceeds from notes recorded as long-term debt																																								853,000,000
Proceeds from notes recorded as equity																																								297,000,000
Discount amortization expense included in interest expense related to the notes																																			24,000,000	22,000,000	45,000,000	43,000,000	40,000,000
Purchased call options with issuance of notes																																								300,000,000
Sale of warrants (in shares)																																								26.3
Excercise price of warrants (per share)																																								$ 62.56
Conversion price of warrants (in dollars per share)																																								$ 62.56
Proceeds from sale of warrants																																								170,000,000
Net cost of purchased call options and warrants																																								130,000,000
Excess of fair value over carrying value of long-term debt			1,400,000,000
Maturities of long-term debt due 2013			268,000,000
Maturities of long-term debt due 2014			1,100,000,000
Maturities of long-term debt due 2015			19,000,000
Maturities of long-term debt due 2016			13,000,000
Maturities of long-term debt due 2017			303,000,000
Lines of credit																																																																													8,500,000,000			6,000,000,000
Unused lines of credit																																																																													5,700,000,000
Weighted average interest rate on short term borrowings (as a percent)																																																																													0.70%	0.78%	0.65%
Borrowing under commercial paper borrowing facility																																																																																2,000,000,000
Outstanding standby letters of credit and surety bonds	729,000,000	729,000,000	911,000,000		644,000,000	729,000,000
Maximum amount provided under accounts receivable securitization facility excluded in lines of credit			1,000,000,000
Amount utilized from the securitization facility			$ 1,000,000,000