Employee Benefit Plans (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Before tax basis amount in accumulated other comprehensive loss.
Total recognized at December 31	$ 5,464	$ 9,742
U.S. [Member]
Before tax basis amount in accumulated other comprehensive loss.
Net actuarial loss	3,185	6,087
Prior service (credit) costs	(22)	58
Total recognized at December 31	3,163	6,145
International [Member]
Before tax basis amount in accumulated other comprehensive loss.
Net actuarial loss	1,808	2,439
Prior service (credit) costs	167	170
Total recognized at December 31	1,975	2,609
Other Benefits [Member]
Before tax basis amount in accumulated other comprehensive loss.
Net actuarial loss	256	968
Prior service (credit) costs	70	20
Total recognized at December 31	$ 326	$ 988