Long-term Financing and Sales of Receivables - Credit Quality of Financing Receivables and Allowance for Credit Losses (Details) - USD ($) $ in Millions	Apr. 01, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Long-term Receivable	$ 46	$ 63
Past Due Under 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1
Past Due Over 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		2
Municipal leases secured tax exempt
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Long-term Receivable	14	20
Municipal leases secured tax exempt | Past Due Under 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1
Municipal leases secured tax exempt | Past Due Over 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		0
Commercial loans and leases secured
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Long-term Receivable	32	43
Commercial loans and leases secured | Past Due Under 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	$ 0
Commercial loans and leases secured | Past Due Over 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		$ 2