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Stockholders' Equity - Schedule of Changes in Stockholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019	Jan. 01, 2018	Jan. 01, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 3,205.0	$ 5,128.0
Comprehensive income [Abstract]
Net earnings	474.0	94.0
Other comprehensive loss	93.0	5.0
Comprehensive income	567.0	99.0
Stock issued (repurchased)	(40.0)
Stock issued (repurchased)		16.0
Dividends declared	(74.0)	(78.0)
Ending balance	3,719.0	5,220.0
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	6,933.0	7,352.0
Comprehensive income [Abstract]
Net earnings	471.0	94.0
Comprehensive income	471.0	94.0
Dividends declared	(74.0)	(78.0)
Ending balance	7,391.0	7,440.0
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(2,695.0)	(2,331.0)
Comprehensive income [Abstract]
Other comprehensive loss	93.0	4.0
Comprehensive income	93.0	4.0
Ending balance	(2,602.0)	(2,344.0)
Treasury Stock and Additional Paid-in-Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(2,059.0)	(935.0)
Comprehensive income [Abstract]
Stock issued (repurchased)	(40.0)
Stock issued (repurchased)		16.0
Ending balance	(2,099.0)	(919.0)
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	112.0	112.0
Comprehensive income [Abstract]
Ending balance	112.0	112.0
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	914.0	930.0
Comprehensive income [Abstract]
Net earnings	3.0
Other comprehensive loss	0.0	1.0
Comprehensive income	3.0	1.0
Ending balance	$ 917.0	$ 931.0
Adjustment to beginning retained earnings
Comprehensive income [Abstract]
Cumulative effect of new accounting principle in period of adoption			$ 61.0	$ 72.0
Adjustment to beginning retained earnings \| Retained Earnings
Comprehensive income [Abstract]
Cumulative effect of new accounting principle in period of adoption			61.0	72.0
Adjustment to beginning accumulated other comprehensive loss
Comprehensive income [Abstract]
Cumulative effect of new accounting principle in period of adoption					$ (17.0)
Adjustment to beginning accumulated other comprehensive loss \| Accumulated Other Comprehensive Income (Loss)
Comprehensive income [Abstract]
Cumulative effect of new accounting principle in period of adoption					$ (17.0)
Accounting Standards Update 2016-02 \| Retained Earnings
Comprehensive income [Abstract]
Cumulative effect of new accounting principle in period of adoption			$ 61.0
Accounting Standards Update 2014-09 \| Retained Earnings
Comprehensive income [Abstract]
Cumulative effect of new accounting principle in period of adoption				0.4
Accounting Standards Update 2016-01 \| Retained Earnings
Comprehensive income [Abstract]
Cumulative effect of new accounting principle in period of adoption				17.0
Accounting Standards Update 2016-16 \| Retained Earnings
Comprehensive income [Abstract]
Cumulative effect of new accounting principle in period of adoption				$ 56.0