Basis of Presentation Basis of Presentation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2013
Basis of Presentation [Abstract]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	20.00%	20.00%
Acquisition of noncontrolling interest	$ (157)	$ (157)	$ 0
Loss on purchase of noncontrolling interest	$ 12

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

No definition available.

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant