Basis of Presentation and Recently Issued Accounting Pronouncements (Out of Period Adjustments) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Adjusted pre-tax income	$ 308	$ 204	$ 294	$ 268
Adjustment to net earnings	(238)	$ (150)	$ (205)	$ (156)
Restatement Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Adjusted pre-tax income	18
Adjustment to net earnings	13
Restatement Adjustment | Adjustments Related to Period Prior to 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Adjusted pre-tax income	13
Restatement Adjustment | Post Acquisition Accounting Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Adjusted pre-tax income	4
Restatement Adjustment | Concession Fee Recoveries
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Adjusted pre-tax income	4
Restatement Adjustment | Adjustment to Obligations for Uncollected Customer Fees
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Adjusted pre-tax income	4
Restatement Adjustment | Capitalization and Timing of Depreciation or Non-Fleet Expenditures
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Adjusted pre-tax income	3
Restatement Adjustment | Other Immaterial Errors
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Adjusted pre-tax income	$ 3