Employee Benefit Plans (Obligations and Funded Status) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Benefits U.S. Plans [Member]
Change in benefit obligations:
Benefit obligations at January 1,	$ 9,480	$ 8,327
Service costs	236	224	187
Interest costs	389	406	404
Plan participants' contributions	0	0
Net actuarial (gains) losses	(1,050)	999
Acquisition, divestitures and curtailments	0	0
Change in benefits	0	0
Benefits paid	(464)	(476)
Effect of foreign currency translation and other	0	0
Benefit obligations at December 31,	8,591	9,480	8,327
Change in plan assets:
Fair value of plan assets at January 1,	7,879	7,108
Actual return on plan assets	(22)	740
Acquisition, divestitures and settlements	0	0
Employer contributions	383	507
Benefits paid	(464)	(476)
Effect of foreign currency translation	0	0
Fair value of plan assets at December 31,	7,776	7,879	7,108
Over (under) funded status at end of year	(815)	(1,601)
Amounts recognized in the consolidated balance sheets consist of:
Other assets	223	0
Other liabilities	(1,038)	(1,601)
Net amount recognized	(815)	(1,601)
Accumulated other comprehensive (income) loss:
Net actuarial (gains) losses	2,274	3,047
Prior service costs (credit)	18	24
Accumulated other comprehensive (income) loss, before income tax	2,292	3,071
Accumulated benefit obligation	8,104	8,866
Pension Benefits Non-U.S. Plans [Member]
Change in benefit obligations:
Benefit obligations at January 1,	823	773
Service costs	67	75	64
Interest costs	14	17	16
Plan participants' contributions	0	0
Net actuarial (gains) losses	34	32
Acquisition, divestitures and curtailments	(19)	(12)
Change in benefits	0	(1)
Benefits paid	(41)	(41)
Effect of foreign currency translation and other	(134)	(20)
Benefit obligations at December 31,	744	823	773
Change in plan assets:
Fair value of plan assets at January 1,	224	185
Actual return on plan assets	34	20
Acquisition, divestitures and settlements	(19)	(11)
Employer contributions	83	74
Benefits paid	(41)	(41)
Effect of foreign currency translation	(33)	(3)
Fair value of plan assets at December 31,	248	224	185
Over (under) funded status at end of year	(496)	(599)
Amounts recognized in the consolidated balance sheets consist of:
Other assets	7	6
Other liabilities	(503)	(605)
Net amount recognized	(496)	(599)
Accumulated other comprehensive (income) loss:
Net actuarial (gains) losses	28	27
Prior service costs (credit)	2	2
Accumulated other comprehensive (income) loss, before income tax	30	29
Accumulated benefit obligation	636	724
Other Postretirement Benefits U.S. Plans [Member]
Change in benefit obligations:
Benefit obligations at January 1,	2,375	2,093
Service costs	20	21	16
Interest costs	92	103	106
Plan participants' contributions	30	29
Net actuarial (gains) losses	(551)	261
Acquisition, divestitures and curtailments	0	0
Change in benefits	0	0
Benefits paid	(132)	(132)
Effect of foreign currency translation and other	0	0
Benefit obligations at December 31,	1,834	2,375	2,093
Change in plan assets:
Fair value of plan assets at January 1,	1,320	1,240
Actual return on plan assets	58	105
Acquisition, divestitures and settlements	0	0
Employer contributions	76	78
Benefits paid	(132)	(132)
Effect of foreign currency translation	0	0
Fair value of plan assets at December 31,	1,352	1,320	1,240
Over (under) funded status at end of year	(482)	(1,055)
Amounts recognized in the consolidated balance sheets consist of:
Other assets	0	0
Other liabilities	(482)	(1,055)
Net amount recognized	(482)	(1,055)
Accumulated other comprehensive (income) loss:
Net actuarial (gains) losses	211	799
Prior service costs (credit)	1	(74)
Accumulated other comprehensive (income) loss, before income tax	212	725
Other Postretirement Benefits Non-U.S. Plans [Member]
Change in benefit obligations:
Benefit obligations at January 1,	43	39
Service costs	2	1	1
Interest costs	2	2	2
Plan participants' contributions	0	0
Net actuarial (gains) losses	(1)	4
Acquisition, divestitures and curtailments	(3)	(3)
Change in benefits	0	0
Benefits paid	(2)	(2)
Effect of foreign currency translation and other	0	2
Benefit obligations at December 31,	41	43	39
Change in plan assets:
Fair value of plan assets at January 1,	15	13
Actual return on plan assets	(1)	2
Acquisition, divestitures and settlements	(3)	(3)
Employer contributions	5	4
Benefits paid	(2)	(2)
Effect of foreign currency translation	0	1
Fair value of plan assets at December 31,	14	15	13
Over (under) funded status at end of year	(27)	(28)
Amounts recognized in the consolidated balance sheets consist of:
Other assets	0	0
Other liabilities	(27)	(28)
Net amount recognized	(27)	(28)
Accumulated other comprehensive (income) loss:
Net actuarial (gains) losses	2	3
Prior service costs (credit)	1	1
Accumulated other comprehensive (income) loss, before income tax	$ 3	$ 4