Retirement Plans and Postretirement Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net periodic benefit cost included in the statement of income was:
Income from continuing operations	$ 428	$ 401
Income (loss) from discontinued operations	45	(47)
Net Income	473	354
Pension [Member]
Components of net periodic benefit cost:
Service cost	20	23
Interest cost	26	24
Expected return on plan assets	(40)	(39)
Amortization of actuarial losses	12	19
Net periodic benefit cost	18	27
Net periodic benefit cost included in the statement of income was:
Income from continuing operations	16	24
Income (loss) from discontinued operations	2	3
Net Income	18	27
Other Postretirement Benefits [Member]
Components of net periodic benefit cost:
Service cost	3	3
Interest cost	6	6
Expected return on plan assets	(6)	(5)
Amortization of actuarial losses	(2)	0
Net periodic benefit cost	1	4
Net periodic benefit cost included in the statement of income was:
Income from continuing operations	1	4
Income (loss) from discontinued operations	0	0
Net Income	$ 1	$ 4