Goodwill and Other Intangible Assets (Other Intangible Assets Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired during the year			$ 0
Finite-Lived Intangible Assets, Gross	$ 76,000,000		76,000,000		$ 76,000,000
Finite-Lived Intangible Assets, Net	32,000,000		32,000,000		39,000,000
Indefinite-Lived Intangible Assets (Excluding Goodwill)	129,000,000		129,000,000		131,000,000
Capitalized Computer Software, Gross	1,400,000,000		1,400,000,000		1,500,000,000
Capitalized Computer Software, Net	761,000,000		761,000,000		$ 790,000,000
Capitalized Computer Software, Development Stage Costs	29,000,000		29,000,000
Impairment of long-lived assets	6,000,000		$ 6,000,000	$ 24,000,000
Amortization of software to be abandoned		$ 33,000,000		75,000,000
Finite-Lived Intangible Assets, Except Capitalized Internal-Use Software [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Weighted-Average Useful Life			4 years
Acquired Finite-lived Intangible Asset, Residual Value	0		$ 0
Amortization expense	4,000,000	3,000,000	7,000,000	4,000,000
Amortization expense for remainder 2015	7,000,000		7,000,000
Amortization expense for 2016	13,000,000		13,000,000
Amortization expense for 2017	3,000,000		3,000,000
Amortization expense for 2018	2,000,000		2,000,000
Amortization expense for 2019	2,000,000		2,000,000
Amortization expense for 2020	2,000,000		2,000,000
Amortization expense thereafter	3,000,000		3,000,000
Capitalized Internal Use Software [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Asset, Residual Value	0		0
Amortization expense	53,000,000	$ 78,000,000	106,000,000	$ 161,000,000
Amortization expense for remainder 2015	106,000,000		106,000,000
Amortization expense for 2016	204,000,000		204,000,000
Amortization expense for 2017	131,000,000		131,000,000
Amortization expense for 2018	75,000,000		75,000,000
Amortization expense for 2019	63,000,000		63,000,000
Amortization expense for 2020	59,000,000		59,000,000
Amortization expense thereafter	$ 123,000,000		$ 123,000,000
Capitalized Internal Use Software, Except Significant System Conversions [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Weighted-Average Useful Life			3 years
Minimum [Member] | Capitalized Internal Use Software, Significant System Conversions [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Weighted-Average Useful Life			8 years
Maximum [Member] | Capitalized Internal Use Software, Significant System Conversions [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Weighted-Average Useful Life			10 years