Goodwill and Other Intangibles, Net (Details) - USD ($)		12 Months Ended
	Dec. 09, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill		$ 2,510,000,000	$ 2,485,000,000
Impairment of goodwill		0	0	$ 0
Accumulated impairment loss		243,000,000	243,000,000
Finite-Lived Intangible Assets [Line Items]
Gross Amount		861,000,000	858,000,000
Accumulated Amortization		(428,000,000)	(367,000,000)
Finite-Lived Intangible Assets, Net		433,000,000	$ 491,000,000
Gradifi [Member]
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets acquired	$ 3,000,000	3,000,000
Goodwill acquired during period	$ 25,000,000	$ 25,000,000
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Original Useful Life		18 years	18 years
Weighted Average Remaining Useful Life		12 years	13 years
Gross Amount		$ 786,000,000	$ 786,000,000
Accumulated Amortization		(394,000,000)	(345,000,000)
Finite-Lived Intangible Assets, Net		392,000,000	$ 441,000,000
Impairment of technology asset related to commission reduction		$ 0
Technology
Finite-Lived Intangible Assets [Line Items]
Weighted Average Original Useful Life		6 years	6 years
Weighted Average Remaining Useful Life		4 years	5 years
Gross Amount		$ 71,000,000	$ 68,000,000
Accumulated Amortization		(30,000,000)	(19,000,000)
Finite-Lived Intangible Assets, Net		$ 41,000,000	$ 49,000,000
Trade name
Finite-Lived Intangible Assets [Line Items]
Weighted Average Original Useful Life		2 years	2 years
Weighted Average Remaining Useful Life		0 years	1 year
Gross Amount		$ 4,000,000	$ 4,000,000
Accumulated Amortization		(4,000,000)	(3,000,000)
Finite-Lived Intangible Assets, Net		$ 0	$ 1,000,000