Restructuring Related Activities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		25 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Dec. 31, 2017
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Incurred Cost	$ 15	$ 16	$ 43	$ 35
Estimated costs of restructuring program by major type of cost
Other Restructuring Costs	11	15	26	30
Restructuring Charges	5	1	18	5
2016 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Incurred Cost					$ 102
Estimated costs of restructuring program by major type of cost
Restructuring and Related Cost, Cost Incurred to Date	184		184		184
Payments for Restructuring			(51)		(148)
Other Restructuring Costs					19
Restructuring Charges					82
Termination Benefits [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Incurred Cost	2	0	15	3
Estimated costs of restructuring program by major type of cost
Other Restructuring Costs	0	0	0	0
Restructuring Charges	2	0	15	3
Termination Benefits [Member] | 2016 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring Reserve	18		18		18	$ 22
Estimated costs of restructuring program by major type of cost
Payments for Restructuring			(20)		(47)
Restructuring Charges			15		63
Transfer costs [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Incurred Cost	16	12	23	24
Estimated costs of restructuring program by major type of cost
Other Restructuring Costs	16	12	23	24
Restructuring Charges	0	0	0	0
Transfer costs [Member] | 2016 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring-related Costs Incurred to Date					83
Estimated costs of restructuring program by major type of cost
Payments for Restructuring			(23)		(82)
Other [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Incurred Cost	(3)	4	6	8
Estimated costs of restructuring program by major type of cost
Other Restructuring Costs	(5)	3	3	6
Restructuring Charges	2	1	3	2
Other [Member] | 2016 Restructuring Plan [Member]
Estimated costs of restructuring program by major type of cost
Payments for Restructuring			(8)		(19)
Restructuring Charges					18
Minimum [Member] | 2016 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Expected Cost	275		275		275
Estimated costs of restructuring program by major type of cost
Restructuring plan estimated future cash outflow			250
Minimum [Member] | Termination Benefits [Member] | 2016 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Expected Cost	105		105		105
Minimum [Member] | Restructuring Plan [Member] | Other [Member] | 2016 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Expected Cost	35		35		35
Minimum [Member] | Restructuring Related To Plan [Member] | Other [Member] | 2016 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Expected Cost	135		135		135
Maximum [Member] | 2016 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Expected Cost	325		325		325
Estimated costs of restructuring program by major type of cost
Restructuring plan estimated future cash outflow			300
Maximum [Member] | Termination Benefits [Member] | 2016 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Expected Cost	115		115		115
Maximum [Member] | Restructuring Plan [Member] | Other [Member] | 2016 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Expected Cost	60		60		60
Maximum [Member] | Restructuring Related To Plan [Member] | Other [Member] | 2016 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Expected Cost	150		150		$ 150
Selling, General and Administrative Expenses [Member]
Estimated costs of restructuring program by major type of cost
Other Restructuring Costs	(5)	3	3	6
Selling, General and Administrative Expenses [Member] | Termination Benefits [Member]
Estimated costs of restructuring program by major type of cost
Other Restructuring Costs	0	0	0	0
Selling, General and Administrative Expenses [Member] | Transfer costs [Member]
Estimated costs of restructuring program by major type of cost
Other Restructuring Costs	0	0	0	0
Selling, General and Administrative Expenses [Member] | Other [Member]
Estimated costs of restructuring program by major type of cost
Other Restructuring Costs	(5)	3	3	6
Cost of Sales [Member]
Estimated costs of restructuring program by major type of cost
Other Restructuring Costs	16	12	23	24
Cost of Sales [Member] | Termination Benefits [Member]
Estimated costs of restructuring program by major type of cost
Other Restructuring Costs	0	0	0	0
Cost of Sales [Member] | Transfer costs [Member]
Estimated costs of restructuring program by major type of cost
Other Restructuring Costs	16	12	23	24
Cost of Sales [Member] | Other [Member]
Estimated costs of restructuring program by major type of cost
Other Restructuring Costs	$ 0	$ 0	$ 0	$ 0