Accumulated Other Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Loss, Pension and Other Benefit Liabilities	$ (5,300)	$ (8,230)	$ (5,349)	$ (8,314)
Accumulated Other Comprehensive Loss, Derivative Contracts	163	(101)	219	(263)
Accumulated Other Comprehensive Loss	(5,137)	(8,331)	(5,130)	(8,577)
Changes in value, Pension and Other Benefit Liabilities, Net of Tax	19	(29)
Changes in value, Derivative contracts, Net of Tax	(23)	207
Changes In value, Accumulated Other Comprehensive Loss, Net of Tax	(4)	178
Reclassification adjustment into earnings, Pension and Other Benefit Liabilities, Net of Tax	30	113
Reclassification adjustment into earnings, Derivative contracts, Net of Tax	(33)	(45)
Reclassification adjustment into earnings, Accumulated Other Comprehensive Loss, Net of Tax	$ (3)	$ 68