Employee Benefit Plans (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Changes Recognized in Comprehensive Income
Prior service (credits) costs during period	$ (60)	$ 142	$ 27
Amortization of prior service (costs) credits	27	61	26
U.S. [Member]
Net Periodic Benefit Cost
Service cost	495	452	374
Interest cost	471	435	463
Expected return on plan assets	(701)	(634)	(613)
Amortization of prior service (credits) costs	2	(7)	(8)
Recognized actuarial losses	485	470	310
Settlement losses	173	220	298
Curtailment losses (gains)	0	0	0
Total net periodic benefit cost	925	936	824
Changes Recognized in Comprehensive Income
Net actuarial (gain) loss during period	(2,244)	805	2,671
Amortization of actuarial loss	(658)	(700)	(608)
Prior service (credits) costs during period	(78)	94	0
Amortization of prior service (costs) credits	(2)	7	8
Total changes recognized in other comprehensive income	(2,982)	206	2,071
Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	(2,057)	1,142	2,895
International [Member]
Net Periodic Benefit Cost
Service cost	197	181	174
Interest cost	314	320	325
Expected return on plan assets	(274)	(269)	(283)
Amortization of prior service (credits) costs	21	18	19
Recognized actuarial losses	143	136	101
Settlement losses	12	5	0
Curtailment losses (gains)	0	0	35
Total net periodic benefit cost	413	391	371
Changes Recognized in Comprehensive Income
Net actuarial (gain) loss during period	(476)	330	448
Amortization of actuarial loss	(155)	(141)	(101)
Prior service (credits) costs during period	18	37	27
Amortization of prior service (costs) credits	(21)	(18)	(54)
Total changes recognized in other comprehensive income	(634)	208	320
Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	(221)	599	691
Other Benefits [Member]
Net Periodic Benefit Cost
Service cost	66	61	58
Interest cost	149	153	180
Expected return on plan assets	0	0	0
Amortization of prior service (credits) costs	(50)	(72)	(72)
Recognized actuarial losses	53	56	64
Settlement losses	0	(26)	0
Curtailment losses (gains)	0	0	(10)
Total net periodic benefit cost	218	172	220
Changes Recognized in Comprehensive Income
Net actuarial (gain) loss during period	(659)	45	131
Amortization of actuarial loss	(53)	(79)	(64)
Prior service (credits) costs during period	0	11	0
Amortization of prior service (costs) credits	50	72	72
Total changes recognized in other comprehensive income	(662)	49	139
Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	$ (444)	$ 221	$ 359