Employee Benefit Plans (Net Periodic Benefit Costs) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Pension Benefits U.S. Plans [Member]
Components of net periodic benefit costs
Service costs	$ 50	$ 59	$ 100	$ 118
Interest costs	109	97	218	194
Expected return on plan assets	(118)	(121)	(237)	(242)
Amortization of net actuarial (gains) losses	44	57	85	114
Amortization of prior service costs (credit)	0	0	1	3
Net periodic benefit costs	85	92	167	187
Pension Benefits Non-U.S. Plans [Member]
Components of net periodic benefit costs
Service costs	14	17	34	34
Interest costs	4	3	7	7
Expected return on plan assets	(2)	(1)	(4)	(3)
Amortization of net actuarial (gains) losses	0	0	0	0
Amortization of prior service costs (credit)	0	0	0	0
Net periodic benefit costs	16	19	37	38
Other Postretirement Benefits U.S. Plans [Member]
Components of net periodic benefit costs
Service costs	4	5	7	10
Interest costs	23	23	46	46
Expected return on plan assets	(18)	(19)	(37)	(38)
Amortization of net actuarial (gains) losses	3	13	6	27
Amortization of prior service costs (credit)	(1)	(18)	(1)	(37)
Net periodic benefit costs	11	4	21	8
Other Postretirement Benefits Non-U.S. Plans [Member]
Components of net periodic benefit costs
Service costs	1	1	1	1
Interest costs	0	0	1	1
Expected return on plan assets	(1)	0	(1)	0
Amortization of net actuarial (gains) losses	0	0	0	0
Amortization of prior service costs (credit)	0	0	0	0
Net periodic benefit costs	$ 0	$ 1	$ 1	$ 2