Intangible Assets and Goodwill (Intangible Assets and Goodwill) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 379	$ 387
Accumulated Amortization	198	160
Net Carrying Value	181	227
Client relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	274	274
Accumulated Amortization	144	116
Net Carrying Value	130	158
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	89	89
Accumulated Amortization	47	37
Net Carrying Value	42	52
Trade name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	16	17
Accumulated Amortization	7	6
Net Carrying Value	$ 9	11
Other intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value		7
Accumulated Amortization		1
Net Carrying Value		$ 6