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Customer Financing (Components Of Investment In Sales-Type Or Finance Leases) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Customer Financing [Abstract]    
Minimum lease payments receivable $ 1,537 $ 1,475
Estimated residual value of leased assets 530 521
Unearned income (447) (461)
Total $ 1,620 $ 1,535