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Stockholders' Equity - Schedule of Changes in Stockholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019	Jan. 01, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 3,719.0	$ 3,205.0	$ 5,220.0	$ 5,128.0	$ 3,205.0	$ 5,128.0
Comprehensive income
Net earnings (loss)	72.0	474.0	(639.0)	94.0	546.0	(545.0)
Other comprehensive loss	(56.0)	93.0	(163.0)	5.0	37.0	(158.0)
Comprehensive income	16.0	567.0	(802.0)	99.0	583.0	(703.0)
Stock issued (repurchased)		(40.0)	(990.0)
Stock issued (repurchased)	(13.0)			16.0
Dividends declared	(81.0)	(74.0)	(84.0)	(78.0)
Ending balance	3,667.0	3,719.0	3,344.0	5,220.0	3,667.0	3,344.0
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	7,391.0	6,933.0	7,440.0	7,352.0	6,933.0	7,352.0
Comprehensive income
Net earnings (loss)	67.0	471.0	(657.0)	94.0
Comprehensive income	67.0	471.0	(657.0)	94.0
Dividends declared	(78.0)	(74.0)	(82.0)	(78.0)
Ending balance	7,380.0	7,391.0	6,701.0	7,440.0	7,380.0	6,701.0
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(2,602.0)	(2,695.0)	(2,344.0)	(2,331.0)	(2,695.0)	(2,331.0)
Comprehensive income
Other comprehensive loss	(55.0)	93.0	(162.0)	4.0	38.0	(158.0)
Comprehensive income	(55.0)	93.0	(162.0)	4.0
Ending balance	(2,657.0)	(2,602.0)	(2,506.0)	(2,344.0)	(2,657.0)	(2,506.0)
Treasury Stock and Additional Paid-in-Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(2,099.0)	(2,059.0)	(919.0)	(935.0)	(2,059.0)	(935.0)
Comprehensive income
Stock issued (repurchased)		(40.0)	(990.0)
Stock issued (repurchased)	(13.0)			16.0
Ending balance	(2,086.0)	(2,099.0)	(1,909.0)	(919.0)	(2,086.0)	(1,909.0)
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	112.0	112.0	112.0	112.0	112.0	112.0
Comprehensive income
Ending balance	112.0	112.0	112.0	112.0	112.0	112.0
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	917.0	914.0	931.0	930.0	914.0	930.0
Comprehensive income
Net earnings (loss)	5.0	3.0	18.0
Other comprehensive loss	(1.0)		(1.0)	1.0	(1.0)	0.0
Comprehensive income	4.0	3.0	17.0	1.0
Dividends declared	(3.0)		(2.0)
Ending balance	$ 918.0	$ 917.0	$ 946.0	$ 931.0	$ 918.0	$ 946.0
Adjustment to beginning retained earnings
Comprehensive income
Cumulative effect of new accounting principle in period of adoption							$ 61.0	$ 72.0
Adjustment to beginning retained earnings \| Retained Earnings
Comprehensive income
Cumulative effect of new accounting principle in period of adoption							61.0	72.0
Adjustment to beginning accumulated other comprehensive loss
Comprehensive income
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
Cumulative effect of new accounting principle in period of adoption								(17.0)
Accounting Standards Update 2016-02 \| Retained Earnings
Comprehensive income
Cumulative effect of new accounting principle in period of adoption							$ 61.0
Accounting Standards Update 2014-09 \| Retained Earnings
Comprehensive income
Cumulative effect of new accounting principle in period of adoption								0.4
Accounting Standards Update 2016-01 \| Retained Earnings
Comprehensive income
Cumulative effect of new accounting principle in period of adoption								17.0
Accounting Standards Update 2016-16 \| Retained Earnings
Comprehensive income
Cumulative effect of new accounting principle in period of adoption								$ 56.0