Employee Benefit Plans Level 4 Net Periodic Benefits Cost and Other Recognized in the OCI (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax	$ 45	$ 59
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Service Cost	2	1	92
Defined Benefit Plan, Interest Cost	258	238	250
Defined Benefit Plan, Expected Return on Plan Assets	(325)	(315)	(312)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	(9)
Defined Benefit Plan, Amortization of Gains (Losses)	45	59	231
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements	128	0	1
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0	0	(11)
Defined Benefit Plan, Net Periodic Benefit Cost	108	(17)	242
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, before Tax	128	0
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	0	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	(622)	137
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	(449)	196
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	2,428	1,979
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	0	0
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	(2,428)	(1,979)
Defined Benefit Plan, Future Amortization of Gain (Loss)	58
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax	5	2
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Service Cost	0	0	2
Defined Benefit Plan, Interest Cost	14	11	14
Defined Benefit Plan, Expected Return on Plan Assets	(14)	(14)	(14)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(7)	(7)	(4)
Defined Benefit Plan, Amortization of Gains (Losses)	5	2	1
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements	0	0	0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0	0	(1)
Defined Benefit Plan, Net Periodic Benefit Cost	(2)	(8)	(2)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, before Tax	0	0
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	(7)	(7)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	(51)	(21)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	(53)	(26)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	124	77
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	97	103
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	(27)	26
Defined Benefit Plan, Future Amortization of Gain (Loss)	$ 0