Asset Impairment, Exit and Implementation Costs (Facilities Consolidation) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended		9 Months Ended	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 29	$ 2	$ 56	$ 124
Payments for restructuring			41
Facilities Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	$ 150		$ 150		$ 150
Expected restructuring charges, per share (usd per share)	$ 0.05		$ 0.05		$ 0.05
Restructuring charges	$ 29		$ 56		$ 127	$ 71
Charges (in usd per share)						$ 0.03
Restructuring and related cost, expected cost fiscal year	70		70		70
Charges expected to result in cash expenditures			90
Payments for restructuring			29		34
Facilities Consolidation [Member] | Accelerated Depreciation and Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	55		55		55
Facilities Consolidation [Member] | Employee Separation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	45		45		45
Facilities Consolidation [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	$ 50		$ 50		$ 50