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		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income tax (benefit) expense	$ 2	$ 57	$ 23	$ 31
Amounts reclassified from Accumulated other comprehensive loss, net of tax	1	4	6	14
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	2	5	8	14
Income tax (benefit) expense	(1)	(1)	(2)	(2)
Amounts reclassified from Accumulated other comprehensive loss, net of tax	$ 1	$ 4	$ 6	$ 13