Changes in Accumulated Other Comprehensive Income Level 4 (Details) - Reclassifications Out of Accumulated Other Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income tax (benefit) expense	$ 10	$ (32)
Amounts reclassified from Accumulated other comprehensive loss, net of tax	3	5
Gains and Losses on Cash Flow Hedges [Member]
Amount Reclassified From Accumulated Other Comprehensive Loss, before tax	0	0
Income tax (benefit) expense	0	1
Amounts reclassified from Accumulated other comprehensive loss, net of tax	0	1
Defined Benefit Pension Items [Member]
Amortization of Actuarial Losses	3	5
Income tax (benefit) expense	0	(1)
Amounts reclassified from Accumulated other comprehensive loss, net of tax	$ 3	$ 4