Employee Benefit Plans (Details 4) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Changes Recognized in Comprehensive Income
Prior service (credits) costs during period	$ (345)	$ (6)	$ 6
Amortization of prior service (costs) credits	(19)	(30)	(26)
U.S. [Member]
Net Periodic Benefit Cost
Service cost	494	538	450
Interest cost	377	502	494
Expected return on plan assets	(723)	(783)	(788)
Amortization of prior service costs (credits)	(9)	(8)	(9)
Recognized actuarial losses	335	356	209
Settlement losses	511	320	237
Curtailment losses (gains)	0	0	0
Total net periodic benefit cost	985	925	593
Changes Recognized in Comprehensive Income
Net actuarial (gain) loss during period	690	513	2,233
Amortization of actuarial loss	(846)	(676)	(446)
Prior service (credits) costs during period	0	0	0
Amortization of prior service (costs) credits	9	8	9
Total changes recognized in other comprehensive income	(147)	(155)	1,796
Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	838	770	2,389
International [Member]
Net Periodic Benefit Cost
Service cost	159	185	190
Interest cost	261	277	340
Expected return on plan assets	(243)	(262)	(298)
Amortization of prior service costs (credits)	14	22	21
Recognized actuarial losses	47	78	96
Settlement losses	6	6	208
Curtailment losses (gains)	0	(14)	0
Total net periodic benefit cost	244	292	557
Changes Recognized in Comprehensive Income
Net actuarial (gain) loss during period	55	(260)	(17)
Amortization of actuarial loss	(53)	(84)	(304)
Prior service (credits) costs during period	0	(6)	4
Amortization of prior service (costs) credits	(14)	(24)	(21)
Total changes recognized in other comprehensive income	(12)	(374)	(338)
Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	232	(82)	219
Other Benefits [Member]
Net Periodic Benefit Cost
Service cost	60	72	50
Interest cost	128	151	148
Expected return on plan assets	0	0	0
Amortization of prior service costs (credits)	14	14	14
Recognized actuarial losses	19	34	7
Settlement losses	0	0	0
Curtailment losses (gains)	0	0	0
Total net periodic benefit cost	221	271	219
Changes Recognized in Comprehensive Income
Net actuarial (gain) loss during period	(430)	(362)	514
Amortization of actuarial loss	(19)	(34)	(7)
Prior service (credits) costs during period	(345)	0	2
Amortization of prior service (costs) credits	(14)	(14)	(14)
Total changes recognized in other comprehensive income	(808)	(410)	495
Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	$ (587)	$ (139)	$ 714