Accumulated Other Comprehensive (Loss) Income (AOCI) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax at beginning of period	$ (631)	$ (553)
OCI	70	33
Income taxes	(2)	8
Cost of sales	1,233	1,104
Other expense	(48)	(49)
Income taxes	(68)	(99)
Net OCI	66	43
Accumulated Other Comprehensive Income (Loss), Net of Tax at end of period	(565)	(510)
Reclassification out of Accumulated Other Comprehensive Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cost of sales	(2)	(1)
Other expense	1	2
Income taxes	(1)	1
Net OCI	66	43
Marketable Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax at beginning of period	(4)	(4)
OCI	1	(1)
Income taxes	0	0
Accumulated Other Comprehensive Income (Loss), Net of Tax at end of period	(3)	(5)
Marketable Securities | Reclassification out of Accumulated Other Comprehensive Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cost of sales	0	0
Other expense	0	0
Income taxes	0	0
Net OCI	1	(1)
Pension Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax at beginning of period	(137)	(134)
OCI	(6)	(10)
Income taxes	1	1
Accumulated Other Comprehensive Income (Loss), Net of Tax at end of period	(141)	(140)
Pension Plans | Reclassification out of Accumulated Other Comprehensive Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cost of sales	0	0
Other expense	1	2
Income taxes	0	1
Net OCI	(4)	(6)
Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax at beginning of period	50	28
OCI	(19)	21
Income taxes	6	(5)
Accumulated Other Comprehensive Income (Loss), Net of Tax at end of period	34	43
Hedges | Reclassification out of Accumulated Other Comprehensive Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cost of sales	(2)	(1)
Other expense	0	0
Income taxes	(1)	0
Net OCI	(16)	15
Financial Statement Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax at beginning of period	(540)	(443)
OCI	94	23
Income taxes	(9)	12
Accumulated Other Comprehensive Income (Loss), Net of Tax at end of period	(455)	(408)
Financial Statement Translation | Reclassification out of Accumulated Other Comprehensive Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cost of sales	0	0
Other expense	0	0
Income taxes	0	0
Net OCI	$ 85	$ 35