Financing Arrangements (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Short-term Debt [Line Items]
Total notes payable	$ 1,111	$ 34
Commercial paper
Short-term Debt [Line Items]
Total notes payable	966	0
Short-term borrowings to banks
Short-term Debt [Line Items]
Total notes payable	$ 145	$ 34