Accumulated Other Comprehensive Income (Accumulated Other Comprehensive Income Balances) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 9	$ 298
Other net changes	99	2
Ending Balance	108	300
Net Unrealized Gain On Securities Available For Sale [Member]
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	9	299
Other net changes	99	1
Ending Balance	108	300
Other [Member]
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance		(1)
Other net changes		$ 1