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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income tax (benefit) expense	$ 11	$ 6	$ 21	$ (26)
Amounts reclassified from Accumulated other comprehensive loss, net of tax	2	5	5	10
Interest Rate Swap [Member]
Interest Expense, interest rate swaps			0	0
Income tax (benefit) expense			0	1
Gains and Losses on Cash Flow Hedges [Member]
Amounts reclassified from Accumulated other comprehensive loss, net of tax				1
Defined Benefit Pension Items [Member]
Amortization of prior service cost				1
Amortization of Actuarial Losses	3	5	6	9
Income tax (benefit) expense	(1)	(1)	(1)	(1)
Amounts reclassified from Accumulated other comprehensive loss, net of tax	$ 2	$ 5	$ 5	$ 9