Equity Equity - AOCI Changes Net of Tax Table (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss) Period Start			$ (162)
Net current period other comprehensive income	(1)	0	8	12
Accumulated Other Comprehensive Income (Loss) Period End	(154)		(154)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss) Period Start			(162)	(182)
Other comprehensive income before reclassifications			3	(5)
Amounts reclassified from accumulated other comprehensive income	(1)	(1)	5	17
Net current period other comprehensive income			8	12
Accumulated Other Comprehensive Income (Loss) Period End	(154)	(170)	(154)	(170)
Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss) Period Start			(167)	(189)
Other comprehensive income before reclassifications			3	0
Amounts reclassified from accumulated other comprehensive income	(1)	(1)	10	11
Net current period other comprehensive income			13	11
Accumulated Other Comprehensive Income (Loss) Period End	(154)	(178)	(154)	(178)
Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss) Period Start			5	7
Other comprehensive income before reclassifications			0	(5)
Amounts reclassified from accumulated other comprehensive income			(5)	6
Net current period other comprehensive income			(5)	1
Accumulated Other Comprehensive Income (Loss) Period End	$ 0	$ 8	$ 0	$ 8