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		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
United States Qualified and Non-qualified Pension Benefits
Net periodic benefit cost (benefit)
Service cost	$ 60	$ 64	$ 180	$ 192
Interest cost	169	150	507	449
Expected return on plan assets	(261)	(262)	(783)	(784)
Amortization of transition (asset) obligation	0	0	0	0
Amortization of prior service cost (benefit)	1	1	3	3
Amortization of net actuarial (gain) loss	60	100	182	300
Net periodic benefit cost (benefit)	29	53	89	160
Settlements, curtailments, special termination benefits and other	0	0	0	0
Net periodic benefit cost (benefit) after settlements, curtailments, special termination benefits and other	29	53	89	160
International Qualified and Non-qualified Pension Benefits
Net periodic benefit cost (benefit)
Service cost	36	37	107	109
Interest cost	65	61	194	183
Expected return on plan assets	(79)	(75)	(238)	(225)
Amortization of transition (asset) obligation	(1)	0	(1)	(1)
Amortization of prior service cost (benefit)	(4)	(4)	(12)	(13)
Amortization of net actuarial (gain) loss	31	39	93	119
Net periodic benefit cost (benefit)	48	58	143	172
Settlements, curtailments, special termination benefits and other	0	0	0	0
Net periodic benefit cost (benefit) after settlements, curtailments, special termination benefits and other	48	58	143	172
Postretirement Benefits
Net periodic benefit cost (benefit)
Service cost	16	20	49	60
Interest cost	24	22	72	66
Expected return on plan assets	(22)	(22)	(67)	(67)
Amortization of transition (asset) obligation	0	0	0	0
Amortization of prior service cost (benefit)	(12)	(16)	(36)	(49)
Amortization of net actuarial (gain) loss	14	24	43	72
Net periodic benefit cost (benefit)	20	28	61	82
Settlements, curtailments, special termination benefits and other	0	0	0	0
Net periodic benefit cost (benefit) after settlements, curtailments, special termination benefits and other	$ 20	$ 28	$ 61	$ 82