Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans	$ 25	$ 60	$ 70	$ 144
Defined Contribution Plans	86	80	182	170
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	124	122	249	244
Interest Cost	350	380	701	760
Expected Return on Plan Assets	565	554	1,134	1,108
Amortization	(2)	(2)	(5)	(4)
Recognized actuarial net loss (gain)	(221)	(107)	(442)	(214)
Net settlement and curtailment loss	(3)	(6)	(9)	(6)
Total net periodic benefit cost	131	59	262	112
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	1	1	2	2
Interest Cost	8	10	16	20
Expected Return on Plan Assets	0	0	0	0
Amortization	0	0	0	0
Recognized actuarial net loss (gain)	1	1	2	2
Net settlement and curtailment loss	0	0	0	0
Total net periodic benefit cost	$ 8	$ 10	16	20
United States Pension Plans Of US Entity Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans			$ 0	$ 0