Investment in Affiliates, at Equity (Details) $ in Millions, ¥ in Billions	3 Months Ended		12 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2018 JPY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items]
Investments in affiliates, at equity			$ 1,403	$ 1,404
Total Equity in net income of unconsolidated affiliates			33	115	$ 127
Fuji Xerox
Schedule of Equity Method Investments [Line Items]
Investments in affiliates, at equity			1,360	1,366
Total Equity in net income of unconsolidated affiliates			$ 25	102	114
Equity Method Investment, Ownership Percentage			25.00%
Implied Investment in Affiliates - Fuji Xerox			$ 1,452
After-tax restructuring and other charges			$ 95	$ 10	$ 3
Summary of operations, weighted average rate	108.07	108.07	110.28	112.14	108.76
Other [Member]
Schedule of Equity Method Investments [Line Items]
Investments in affiliates, at equity			$ 43	$ 38
Total Equity in net income of unconsolidated affiliates			$ 8	$ 13	$ 13
Restatement Adjustment [Member] | Parent Company | Fuji Xerox
Schedule of Equity Method Investments [Line Items]
Out-of-Period Adjustment - Fuji Xerox	$ 110	¥ 12
Restatement Adjustment [Member] | NonParentEquityInvestmentOwner [Member] | Fuji Xerox
Schedule of Equity Method Investments [Line Items]
Out-of-Period Adjustment - Fuji Xerox	$ 28