Accumulated Other Comprehensive (Loss) Income (AOCI) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax at beginning of period	$ (510)	$ (675)	$ (553)	$ (761)
OCI	(49)	63	(16)	128
Income taxes	1	19	9	35
Cost of sales	1,132	1,021	2,236	2,012
Other income (expense), net	(49)	(58)	(98)	(115)
Income taxes	(171)	(53)	(270)	(108)
Total other comprehensive income, net of tax	(47)	85	(4)	171
Accumulated Other Comprehensive Income (Loss), Net of Tax at end of period	(557)	(590)	(557)	(590)
Reclassification out of Accumulated Other Comprehensive Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cost of sales	1	4	2	11
Other income (expense), net	1		1
Income taxes	(1)	(1)	0	(3)
Total other comprehensive income, net of tax	(47)	85	(4)	171
Marketable Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax at beginning of period	(5)	0	(4)	0
OCI	(1)	0	(2)	0
Income taxes	0	0	0	0
Accumulated Other Comprehensive Income (Loss), Net of Tax at end of period	(5)	0	(5)	0
Marketable Securities | Reclassification out of Accumulated Other Comprehensive Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cost of sales	0	0	0	0
Other income (expense), net	1		1
Income taxes	0	0	0	0
Total other comprehensive income, net of tax	0	0	(1)	0
Pension Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax at beginning of period	(140)	(136)	(134)	(132)
OCI	6	(9)	(4)	(15)
Income taxes	2	2	3	3
Accumulated Other Comprehensive Income (Loss), Net of Tax at end of period	(132)	(142)	(132)	(142)
Pension Plans | Reclassification out of Accumulated Other Comprehensive Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cost of sales	2	1	4	3
Other income (expense), net	0		0
Income taxes	(2)	0	(1)	(1)
Total other comprehensive income, net of tax	8	(6)	2	(10)
Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax at beginning of period	43	18	28	24
OCI	3	4	24	(10)
Income taxes	(1)	(1)	(6)	3
Accumulated Other Comprehensive Income (Loss), Net of Tax at end of period	45	23	45	23
Hedges | Reclassification out of Accumulated Other Comprehensive Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cost of sales	(1)	3	(2)	8
Other income (expense), net	0		0
Income taxes	1	(1)	1	(2)
Total other comprehensive income, net of tax	2	5	17	(1)
Financial Statement Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax at beginning of period	(408)	(557)	(443)	(653)
OCI	(57)	68	(34)	153
Income taxes	0	18	12	29
Accumulated Other Comprehensive Income (Loss), Net of Tax at end of period	(465)	(471)	(465)	(471)
Financial Statement Translation | Reclassification out of Accumulated Other Comprehensive Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cost of sales	0	0	0	0
Other income (expense), net	0		0
Income taxes	0	0	0	0
Total other comprehensive income, net of tax	$ (57)	$ 86	$ (22)	$ 182