Employee Benefit Plans (Net Periodic Benefit Costs) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Pension Benefits U.S. Plans [Member]
Components of net periodic benefit costs
Service costs	$ 50	$ 59	$ 150	$ 177
Interest costs	109	98	327	292
Settlement and curtailment costs	14	0	14	0
Expected return on plan assets	(119)	(121)	(356)	(363)
Amortization of net actuarial (gains) losses	42	57	127	171
Amortization of prior service costs (credit)	0	2	1	5
Net periodic benefit costs	96	95	263	282
Pension Benefits U.S. Plans [Member] | Qualified Plan Pension Plan [Member]
Components of net periodic benefit costs
Discretionary contributions made by Subsidiaries			303
Pension Benefits Non-U.S. Plans [Member]
Components of net periodic benefit costs
Service costs	17	16	51	50
Interest costs	3	4	10	11
Settlement and curtailment costs	0	0	0	0
Expected return on plan assets	(2)	(2)	(6)	(5)
Amortization of net actuarial (gains) losses	0	0	0	0
Amortization of prior service costs (credit)	0	0	0	0
Net periodic benefit costs	18	18	55	56
Other Postretirement Benefits U.S. Plans [Member]
Components of net periodic benefit costs
Service costs	3	5	10	15
Interest costs	23	23	69	69
Settlement and curtailment costs	0	0	0	0
Expected return on plan assets	(19)	(18)	(56)	(56)
Amortization of net actuarial (gains) losses	3	14	9	41
Amortization of prior service costs (credit)	0	(19)	(1)	(56)
Net periodic benefit costs	10	5	31	13
Other Postretirement Benefits Non-U.S. Plans [Member]
Components of net periodic benefit costs
Service costs	0	0	1	1
Interest costs	1	1	2	2
Settlement and curtailment costs	0	0	0	0
Expected return on plan assets	0	(1)	(1)	(1)
Amortization of net actuarial (gains) losses	0	0	0	0
Amortization of prior service costs (credit)	0	0	0	0
Net periodic benefit costs	$ 1	$ 0	$ 2	$ 2