Employee Benefit Plans (Net Periodic Benefit Costs and Other Changes Recognized in OCI) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net Periodic Benefit Cost Amortized From Accumulated Other Comprehensive Income (Loss) [Abstract]
Total recognized in other comprehensive income (loss)	$ (1,292)	$ 842	$ 760
Pension Benefits U.S. Plans [Member]
Net periodic benefit costs [Abstract]
Service costs	236	224	187
Interest costs	389	406	404
Settlement and curtailment costs	0	0	0
Expected return on plan assets	(483)	(484)	(448)
Amortization of net actuarial (gains) losses	228	195	194
Amortization of prior service costs (credit)	6	6	4
Total net periodic benefit costs (credit)	376	347	341
Net Periodic Benefit Cost Amortized From Accumulated Other Comprehensive Income (Loss) [Abstract]
Net actuarial (gains) losses	(545)	744	575
Prior service costs (credit)	0	0	17
Amortization of net actuarial gains (losses)	(228)	(195)	(194)
Amortization of prior service (costs) credit	(6)	(6)	(4)
Total recognized in other comprehensive income (loss)	(779)	543	394
Total recognized in net periodic benefit costs and other comprehensive income (loss)	(403)	890	735
Pension Benefits Non-U.S. Plans [Member]
Net periodic benefit costs [Abstract]
Service costs	67	75	64
Interest costs	14	17	16
Settlement and curtailment costs	(2)	0	0
Expected return on plan assets	(6)	(6)	(6)
Amortization of net actuarial (gains) losses	0	0	0
Amortization of prior service costs (credit)	0	0	0
Total net periodic benefit costs (credit)	73	86	74
Net Periodic Benefit Cost Amortized From Accumulated Other Comprehensive Income (Loss) [Abstract]
Net actuarial (gains) losses	1	18	34
Prior service costs (credit)	0	(1)	0
Amortization of net actuarial gains (losses)	0	0	0
Amortization of prior service (costs) credit	0	0	0
Total recognized in other comprehensive income (loss)	1	17	34
Total recognized in net periodic benefit costs and other comprehensive income (loss)	74	103	108
Other Postretirement Benefits U.S. Plans [Member]
Net periodic benefit costs [Abstract]
Service costs	20	21	16
Interest costs	92	103	106
Settlement and curtailment costs	0	0	0
Expected return on plan assets	(75)	(77)	(76)
Amortization of net actuarial (gains) losses	55	57	43
Amortization of prior service costs (credit)	(75)	(104)	(108)
Total net periodic benefit costs (credit)	17	0	(19)
Net Periodic Benefit Cost Amortized From Accumulated Other Comprehensive Income (Loss) [Abstract]
Net actuarial (gains) losses	(533)	234	262
Prior service costs (credit)	0	0	0
Amortization of net actuarial gains (losses)	(55)	(57)	(43)
Amortization of prior service (costs) credit	75	104	108
Total recognized in other comprehensive income (loss)	(513)	281	327
Total recognized in net periodic benefit costs and other comprehensive income (loss)	(496)	281	308
Other Postretirement Benefits Non-U.S. Plans [Member]
Net periodic benefit costs [Abstract]
Service costs	2	1	1
Interest costs	2	2	2
Settlement and curtailment costs	1	1	1
Expected return on plan assets	(1)	(1)	(1)
Amortization of net actuarial (gains) losses	0	0	0
Amortization of prior service costs (credit)	0	0	0
Total net periodic benefit costs (credit)	4	3	3
Net Periodic Benefit Cost Amortized From Accumulated Other Comprehensive Income (Loss) [Abstract]
Net actuarial (gains) losses	1	2	5
Prior service costs (credit)	0	(1)	0
Amortization of net actuarial gains (losses)	(2)	0	0
Amortization of prior service (costs) credit	0	0	0
Total recognized in other comprehensive income (loss)	(1)	1	5
Total recognized in net periodic benefit costs and other comprehensive income (loss)	$ 3	$ 4	$ 8