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Component: (Network and Table)
Network
2423406 - Disclosure - Employee Benefit Plans - Schedule of Net Periodic Benefit Costs (Details)
(http://www.capitalone.com/role/EmployeeBenefitPlansScheduleOfNetPeriodicBenefitCostsDetails)
TableSchedule of Defined Benefit Plans Disclosures [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000927628 (http://www.sec.gov/CIK)
Defined Benefit Plan Disclosure [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Defined Pension BenefitsOther Postretirement BenefitsDefined Pension BenefitsOther Postretirement BenefitsDefined Pension BenefitsOther Postretirement Benefits
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
 
 
 
 
 
 
Service cost
2,000,000  
0  
1,000,000  
0  
1,000,000  
0  
Interest cost
7,000,000  
2,000,000  
8,000,000  
2,000,000  
8,000,000  
2,000,000  
Expected return on plan assets
(14,000,000) 
0  
(15,000,000) 
0  
(14,000,000) 
0  
Amortization of transition obligation, prior service credit, and net actuarial loss (gain)
1,000,000  
(6,000,000) 
1,000,000  
(4,000,000) 
1,000,000  
(3,000,000) 
Net periodic benefit gain
(4,000,000) 
 
(4,000,000) 
 
(5,000,000) 
 
(2,000,000) 
 
(4,000,000) 
 
(1,000,000)