Employee Separation / Asset Related Charges, Net (2014 Restructuring Program schedule) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 206
2014 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	263
Restructuring reserve, payments	(3)
Restructuring Reserve, asset write-offs and adjustments	(94)
Restructuring reserve	166
Employee Severance [Member] | 2014 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	166
Restructuring reserve, payments	(3)
Restructuring Reserve, asset write-offs and adjustments	0
Restructuring reserve	163
Other Non-Personnel Charges [Member] | 2014 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3
Restructuring reserve, payments	0
Restructuring Reserve, asset write-offs and adjustments	0
Restructuring reserve	3
Asset Shut Down Charges [Member] | 2014 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	94
Restructuring reserve, payments	0
Restructuring Reserve, asset write-offs and adjustments	(94)
Restructuring reserve	$ 0