Debt And Financing Activities (Schedule Of Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified			0 Months Ended	12 Months Ended				1 Months Ended	12 Months Ended			12 Months Ended							1 Months Ended	12 Months Ended			12 Months Ended					12 Months Ended		1 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended						12 Months Ended									12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Feb. 15, 2014 6.50% Notes Due February 15, 2014 [Member]	Mar. 31, 2014 6.50% Notes Due February 15, 2014 [Member]	Mar. 31, 2013 6.50% Notes Due February 15, 2014 [Member]	Mar. 31, 2014 Floating Rate Notes Due September 10, 2015 [Member]	Mar. 31, 2013 Floating Rate Notes Due September 10, 2015 [Member]	Dec. 31, 2012 0.95% Notes Due December 4, 2015 [Member]	Mar. 31, 2014 0.95% Notes Due December 4, 2015 [Member]	Mar. 31, 2013 0.95% Notes Due December 4, 2015 [Member]	Dec. 04, 2012 0.95% Notes Due December 4, 2015 [Member]	Mar. 31, 2014 3.25% Notes Due March 1, 2016 [Member]	Mar. 31, 2013 3.25% Notes Due March 1, 2016 [Member]	Mar. 31, 2014 5.70% Notes Due March 1, 2017 [Member]	Mar. 31, 2013 5.70% Notes Due March 1, 2017 [Member]	Mar. 31, 2014 1.29 % Notes Due March 10, 2017 [Member]	Mar. 31, 2013 1.29 % Notes Due March 10, 2017 [Member]	Mar. 05, 2014 1.29 % Notes Due March 10, 2017 [Member]	Mar. 31, 2013 1.40% Notes Due March 15, 2018 [Member]	Mar. 31, 2014 1.40% Notes Due March 15, 2018 [Member]	Mar. 31, 2013 1.40% Notes Due March 15, 2018 [Member]	Mar. 08, 2013 1.40% Notes Due March 15, 2018 [Member]	Mar. 31, 2014 7.50% Notes Due February 15, 2019 [Member]	Mar. 31, 2013 7.50% Notes Due February 15, 2019 [Member]	Mar. 31, 2014 2.28% Notes Due March 15, 2019 [Member]	Mar. 05, 2014 2.28% Notes Due March 15, 2019 [Member]	Mar. 31, 2013 2.28% Notes Due March 15, 2019 [Member]	Mar. 31, 2014 4.75% Notes Due March 1, 2021 [Member]	Mar. 31, 2013 4.75% Notes Due March 1, 2021 [Member]	Dec. 31, 2012 2.70% Notes Due December 15, 2022 [Member]	Mar. 31, 2014 2.70% Notes Due December 15, 2022 [Member]	Mar. 31, 2013 2.70% Notes Due December 15, 2022 [Member]	Dec. 04, 2012 2.70% Notes Due December 15, 2022 [Member]	Mar. 31, 2013 2.85% Notes Due March 15, 2023 [Member]	Mar. 31, 2014 2.85% Notes Due March 15, 2023 [Member]	Mar. 31, 2013 2.85% Notes Due March 15, 2023 [Member]	Mar. 08, 2013 2.85% Notes Due March 15, 2023 [Member]	Mar. 31, 2014 3.80% Notes Due March 15, 2024 [Member]	Mar. 05, 2014 3.80% Notes Due March 15, 2024 [Member]	Mar. 31, 2013 3.80% Notes Due March 15, 2024 [Member]	Mar. 31, 2014 7.65% Debentures Due March 1, 2027 [Member]	Mar. 31, 2013 7.65% Debentures Due March 1, 2027 [Member]	Mar. 31, 2014 6.00% Notes Due March 1, 2041 [Member]	Mar. 31, 2013 6.00% Notes Due March 1, 2041 [Member]	Mar. 31, 2014 4.88 % Notes Due March 15, 2044 [Member]	Mar. 05, 2014 4.88 % Notes Due March 15, 2044 [Member]	Mar. 31, 2013 4.88 % Notes Due March 15, 2044 [Member]	Mar. 31, 2014 Other Long Term Debt [Member]	Mar. 31, 2013 Other Long Term Debt [Member]	Mar. 31, 2014 Celesio [Member] 4.00 % Bonds Due October 18, 2016 [Member]	Mar. 31, 2013 Celesio [Member] 4.00 % Bonds Due October 18, 2016 [Member]	Mar. 31, 2014 Celesio [Member] 4.50% Bonds Due April 26, 2017 [Member]	Mar. 31, 2013 Celesio [Member] 4.50% Bonds Due April 26, 2017 [Member]	Mar. 31, 2014 Celesio [Member] Promissory Notes [Member]	Mar. 31, 2013 Celesio [Member] Promissory Notes [Member]	Mar. 31, 2014 Celesio [Member] Bank Liabilities and Other [Member]	Mar. 31, 2013 Celesio [Member] Bank Liabilities and Other [Member]
Debt Instrument [Line Items]
Long-term debt	$ 10,373	$ 4,873		$ 0	$ 350	$ 400	$ 0		$ 499	$ 499		$ 599	$ 599	$ 500	$ 500	$ 700	$ 0		$ 499	$ 499	$ 499		$ 349	$ 349	$ 1,100		$ 0	$ 598	$ 598		$ 400	$ 400		$ 400	$ 400	$ 400		$ 1,100		$ 0	$ 175	$ 175	$ 493	$ 493	$ 800		$ 0	$ 27	$ 11	$ 507	$ 0	$ 737	$ 0
Repayments of Other Short-term Debt			350
Interest rate on debt			6.50%	6.50%	6.50%				0.95%	0.95%	0.95%	3.25%	3.25%	5.70%	5.70%	1.29%	1.29%	1.29%	1.40%	1.40%	1.40%	1.40%	7.50%	7.50%		2.28%		4.75%	4.75%		2.70%	2.70%	2.70%	2.85%	2.85%	2.85%	2.85%		3.80%		7.65%	7.65%	6.00%	6.00%		4.88%				4.00%	4.00%	4.50%	4.50%
Debt Instrument, Maturity Date				Feb. 15, 2014	Feb. 15, 2014			Dec. 04, 2015	Dec. 04, 2015	Dec. 04, 2015		Mar. 01, 2016	Mar. 01, 2016	Mar. 01, 2017	Mar. 01, 2017	Mar. 10, 2017	Mar. 10, 2017		Mar. 15, 2018	Mar. 15, 2018	Mar. 15, 2018		Feb. 15, 2019	Feb. 15, 2019				Mar. 01, 2021	Mar. 01, 2021	Dec. 15, 2022	Dec. 15, 2022	Dec. 15, 2022		Mar. 15, 2023	Mar. 15, 2023	Mar. 15, 2023					Mar. 01, 2027	Mar. 01, 2027	Mar. 01, 2041	Mar. 01, 2041						Oct. 18, 2016	Oct. 18, 2016	Apr. 26, 2017	Apr. 26, 2017
Other long-term debt																																																						297	0	193	0
Less current portion	(1,424)	(352)
Total long-term debt	$ 8,949	$ 4,521