Pension and Postretirement Benefit Plans (Components of net periodic benefit cost and other information) (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
United States Qualified and Non-qualified Pension Benefits
Net periodic benefit cost (benefit)
Service cost	$ 60	$ 64	$ 120	$ 128
Interest cost	169	149	338	299
Expected return on plan assets	(261)	(261)	(522)	(522)
Amortization of transition (asset) obligation	0	0	0	0
Amortization of prior service cost (benefit)	1	1	2	2
Amortization of net actuarial (gain) loss	61	100	122	200
Net periodic benefit cost (benefit)	30	53	60	107
Settlements, curtailments, special termination benefits and other	0	0	0	0
Net periodic benefit cost (benefit) after settlements, curtailments, special termination benefits and other	30	53	60	107
International Qualified and Non-qualified Pension Benefits
Net periodic benefit cost (benefit)
Service cost	35	36	71	72
Interest cost	65	61	129	122
Expected return on plan assets	(80)	(75)	(159)	(150)
Amortization of transition (asset) obligation	0	0	0	(1)
Amortization of prior service cost (benefit)	(4)	(5)	(8)	(9)
Amortization of net actuarial (gain) loss	31	40	62	80
Net periodic benefit cost (benefit)	47	57	95	114
Settlements, curtailments, special termination benefits and other	0	0	0	0
Net periodic benefit cost (benefit) after settlements, curtailments, special termination benefits and other	47	57	95	114
Postretirement Benefits
Net periodic benefit cost (benefit)
Service cost	17	20	33	40
Interest cost	24	22	48	44
Expected return on plan assets	(23)	(23)	(45)	(45)
Amortization of transition (asset) obligation	0	0	0	0
Amortization of prior service cost (benefit)	(12)	(16)	(24)	(33)
Amortization of net actuarial (gain) loss	15	24	29	48
Net periodic benefit cost (benefit)	21	27	41	54
Settlements, curtailments, special termination benefits and other	0	0	0	0
Net periodic benefit cost (benefit) after settlements, curtailments, special termination benefits and other	$ 21	$ 27	$ 41	$ 54