Debt and Financing Arrangements Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Debt Instrument [Line Items]
Capital lease obligations	$ 65	$ 80
Other	42	28
Gross long-term debt	5,379	5,745
Less: current portion	819	424
Net long-term debt	4,560	5,321
5.8 % Due in 2013
Debt Instrument [Line Items]
Gross long-term debt	0	100
4.875 % Due in 2013
Debt Instrument [Line Items]
Gross long-term debt	0	310
Floating Rate Notes Due in 2014
Debt Instrument [Line Items]
Gross long-term debt	350	350
1.75 % Due in 2014
Debt Instrument [Line Items]
Gross long-term debt	452	456
7.7 % Due in 2015
Debt Instrument [Line Items]
Gross long-term debt	125	125
5.5 % Due in 2016
Debt Instrument [Line Items]
Gross long-term debt	802	800
7.125 % Due in 2017
Debt Instrument [Line Items]
Gross long-term debt	159	162
2.6 % Due in 2017
Debt Instrument [Line Items]
Gross long-term debt	400	400
2.355 % Due in 2017
Debt Instrument [Line Items]
Gross long-term debt	46	46
5.0 % Due in 2020
Debt Instrument [Line Items]
Gross long-term debt	498	498
4.25% Due in 2021
Debt Instrument [Line Items]
Gross long-term debt	497	497
3.75 % Due in 2022
Debt Instrument [Line Items]
Gross long-term debt	448	447
6.0 % Due in 2036
Debt Instrument [Line Items]
Gross long-term debt	395	395
5.7 % Due in 2041
Debt Instrument [Line Items]
Gross long-term debt	299	299
5.25 % Due in 2042
Debt Instrument [Line Items]
Gross long-term debt	250	250
6.95 % Due in 2046
Debt Instrument [Line Items]
Gross long-term debt	125	125
Euro
Debt Instrument [Line Items]
Gross long-term debt	$ 426	$ 377