Employee Benefit Plans (Net Periodic Benefit Costs) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Pension Benefits U.S. Plans [Member]
Components of net periodic benefit costs
Service costs	$ 50	$ 59
Interest costs	109	97
Expected return on plan assets	(119)	(121)
Amortization of net actuarial (gains) losses	41	57
Amortization of prior service costs (credit)	1	3
Net periodic benefit costs	82	95
Pension Benefits Non-U.S. Plans [Member]
Components of net periodic benefit costs
Service costs	20	17
Interest costs	3	4
Expected return on plan assets	(2)	(2)
Amortization of net actuarial (gains) losses	0	0
Amortization of prior service costs (credit)	0	0
Net periodic benefit costs	21	19
Other Postretirement Benefits U.S. Plans [Member]
Components of net periodic benefit costs
Service costs	3	5
Interest costs	23	23
Expected return on plan assets	(19)	(19)
Amortization of net actuarial (gains) losses	3	14
Amortization of prior service costs (credit)	0	(19)
Net periodic benefit costs	10	4
Other Postretirement Benefits Non-U.S. Plans [Member]
Components of net periodic benefit costs
Service costs	0	0
Interest costs	1	1
Expected return on plan assets	0	0
Amortization of net actuarial (gains) losses	0	0
Amortization of prior service costs (credit)	0	0
Net periodic benefit costs	$ 1	$ 1