Share Owners' Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 31, 2018	Dec. 31, 2017
Increase (Decrease) in Share Owners' Equity
Balance	$ 1,119	$ 615	$ 927	$ 363
Reissuance of common stock	$ 3	$ 2	$ 4	$ 5
Reissuance of common stock (in shares)	31,468	199,478	286,455	297,875
Treasury shares purchased	$ (50)		$ (95)
Treasury shares purchased (in shares)	2,676,363		4,676,122
Stock compensation	$ 11	$ 5	$ 16	$ 8
Net earnings	56	143	158	196
Other comprehensive income	(240)	14	(111)	207
Balance	$ 899	$ 779	$ 899	$ 779
Repurchase of common stock					$ 400
Authorization of common stock
Common stock, shares authorized	250,000,000		250,000,000
Common stock, par value (in dollars per share)	$ 0.01		$ 0.01
Shares of common stock issued (including treasury shares)	186,423,000	185,692,000	186,423,000	185,692,000		185,728,000
Treasury stock, shares	27,176,000	22,816,000	27,176,000	22,816,000		22,649,000
Common Stock
Increase (Decrease) in Share Owners' Equity
Balance	$ 2	$ 2	$ 2	$ 2
Balance	2	2	2	2
Capital in Excess of Par Value
Increase (Decrease) in Share Owners' Equity
Balance	3,104	3,083	3,099	3,080
Stock compensation	11	5	16	8
Balance	3,115	3,088	3,115	3,088
Treasury Stock
Increase (Decrease) in Share Owners' Equity
Balance	(595)	(557)	(551)	(560)
Reissuance of common stock	3	2	4	5
Treasury shares purchased	(50)		(95)
Balance	(642)	(555)	(642)	(555)
Retained Earnings
Increase (Decrease) in Share Owners' Equity
Balance	182	(48)	85	(96)
Net earnings	50	140	147	188
Balance	232	92	232	92
Accumulated Other Comprehensive Loss.
Increase (Decrease) in Share Owners' Equity
Balance	(1,704)	(1,981)	(1,827)	(2,172)
Other comprehensive income	(225)	24	(102)	215
Balance	(1,929)	(1,957)	(1,929)	(1,957)
Non-Controlling Interests
Increase (Decrease) in Share Owners' Equity
Balance	130	116	119	109
Net earnings	6	3	11	8
Other comprehensive income	(15)	(10)	(9)	(8)
Balance	$ 121	$ 109	$ 121	$ 109