Retirement Plans and Postretirement Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Amounts were included in the statement of income as follows:
Income from Continuing Operations	$ 406		$ 445	$ 1,223	$ 1,312
Income from Discontinued Operations	46		79	48	579
Net Income	452		524	1,271	1,891
Pension [Member]
Components of net periodic benefit cost:
Service cost	21		24	67	73
Interest cost	26		28	74	83
Expected return on plan assets	(39)		(39)	(117)	(118)
Amortization of actuarial loss	14		13	52	39
Amortization of prior service cost	0		0	0	0
Settlement/curtailment loss	10	34	0	44	0
Net periodic benefit cost	32		26	120	77
Amounts were included in the statement of income as follows:
Income from Continuing Operations	27		24	112	70
Income from Discontinued Operations	5		2	8	7
Net Income	32		26	120	77
Other Postretirement Benefits [Member]
Components of net periodic benefit cost:
Service cost	3		3	9	10
Interest cost	6		7	18	21
Expected return on plan assets	(5)		(5)	(16)	(15)
Amortization of actuarial loss	0		0	0	0
Amortization of prior service cost	0		1	1	2
Settlement/curtailment loss	0		0	0	0
Net periodic benefit cost	4		6	12	18
Amounts were included in the statement of income as follows:
Income from Continuing Operations	3		5	10	16
Income from Discontinued Operations	1		1	2	2
Net Income	$ 4		$ 6	$ 12	$ 18