Derivative Instruments (Textuals) (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	Jun. 30, 2014 Parent [Member]	Dec. 31, 2013 Parent [Member]	Jun. 30, 2014 Noncontrolling Interest [Member]	Dec. 31, 2013 Noncontrolling Interest [Member]
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	$ 0	$ 2	$ 0	$ 3
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax					156	148	12	11
Derivative Instruments (Textuals) [Abstract]
Maximum length of time hedging using interest rate derivative instruments			9 years
Derivative, Net Liability Position, Aggregate Fair Value	14		14
Collateral Already Posted, Aggregate Fair Value	13		13
Additional Collateral, Aggregate Fair Value	0		0
(Gain) Loss on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net	5		10
Cash Flow Hedge (Gain) Loss to be Reclassified within Twelve Months			$ 43