Business Combinations and Divestitures - Acquisition of Cardtronics plc (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Jan. 25, 2021	Dec. 31, 2019
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Business Combination, Consideration Transferred		$ 2	$ 20
Goodwill	$ 4,519	4,519	2,837		$ 2,832
Business Acquisition, Goodwill, Expected Tax Deductible Amount	9	9
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual	627
Cardtronics Income from Operations before income taxes	39
Business Acquisition, Pro Forma Revenue		7,634	7,210
Business Acquisition, Pro Forma Net Income (Loss)		286	(216)
Business Acquisition, Pro Forma Eliminations, Revenue		53	91
Business Acquisition, Pro Forma Expenses Incremental Amortization Changes Attributable to Acquiree		25	51
BusinessAcquisitionsProFormaExpensesTransactionsCosts		87	65
Business Acquisition Pro Forma Expenses Incremental Interest Charges Attributable to Acquiree		35	$ 79
Cardtronics
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Business Acquisition, Transaction Costs	46	46
Cardtronics
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Business Acquisition, Share Price				$ 39.00
Business Combination, Consideration Transferred, Cash and Certain Restricted Stock and Stock Option Awards		1,775
Business Combination, Consideration Transferred, Liabilities Incurred		809
Business Combination, Consideration Transferred, Transaction Costs Paid by NCR on Behalf of Cardtronic		57
Converted Cardtronics Awards Attributable to Pre-Combination Services		19
Business Combination, Consideration Transferred, Settlement of Pre-Existing relationships		14
Business Combination, Consideration Transferred		2,674
Goodwill	1,604	1,604
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	291	291
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables	85	85
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	194	194
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	362	362
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	864	864
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	1,796	1,796
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	726	726
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	1,070	1,070
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets	864	864
Business Acquisition, Goodwill, Expected Tax Deductible Amount	139	139
Cardtronics | Customer Relationships [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets	373	$ 373
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		15 years
Cardtronics | Patented Technology [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets	441	$ 441
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		8 years
Cardtronics | Noncompete Agreements
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets	1	$ 1
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		1 year
Cardtronics | Tradenames [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets	$ 49	$ 49
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		4 years