Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Total
Beginning balance			$ 4,844
Comprehensive (loss) income before reclassifications	$ 33	$ (104)	(19)	$ (121)
Income taxes associated with comprehensive (loss) income before reclassifications	26	(8)	21	(11)
Reclassification from accumulated other comprehensive loss	(3)	4	(7)	35
Income taxes reclassified into net earnings	(143)	(66)	(186)	(230)
Ending balance	4,918		4,918
Gain (loss) reclassified from AOCI to income
Total
Income taxes reclassified into net earnings	1	(1)	2	(8)
Accumulated other comprehensive income (loss)
Total
Beginning balance	(787)	(670)	(727)	(674)
Ending balance	(730)	(779)	(730)	(779)
Foreign currency translation adjustments
Total
Beginning balance	(557)	(463)	(497)	(441)
Comprehensive (loss) income before reclassifications	25	(107)	(31)	(127)
Income taxes associated with comprehensive (loss) income before reclassifications	24	(7)	20	(9)
Reclassification from accumulated other comprehensive loss	0	0	0	0
Ending balance	(508)	(577)	(508)	(577)
Foreign currency translation adjustments | Gain (loss) reclassified from AOCI to income
Total
Income taxes reclassified into net earnings	0	0	0	0
Hedge instruments
Total
Beginning balance	(1)	(1)	0	0
Comprehensive (loss) income before reclassifications	1	0	(1)	(1)
Income taxes associated with comprehensive (loss) income before reclassifications	0	0	0	0
Reclassification from accumulated other comprehensive loss	0	1	1	1
Ending balance	0	0	0	0
Hedge instruments | Gain (loss) reclassified from AOCI to income
Total
Income taxes reclassified into net earnings	0	0	0	0
Defined benefit retirement plans
Total
Beginning balance	(229)	(208)	(230)	(235)
Comprehensive (loss) income before reclassifications	7	3	13	7
Income taxes associated with comprehensive (loss) income before reclassifications	2	(1)	1	(2)
Reclassification from accumulated other comprehensive loss	(3)	3	(8)	34
Ending balance	(222)	(204)	(222)	(204)
Defined benefit retirement plans | Gain (loss) reclassified from AOCI to income
Total
Income taxes reclassified into net earnings	1	(1)	2	(8)
Other
Total
Beginning balance	0	2	0	2
Comprehensive (loss) income before reclassifications	0	0	0	0
Income taxes associated with comprehensive (loss) income before reclassifications	0	0	0	0
Reclassification from accumulated other comprehensive loss	0	0	0	0
Ending balance	0	2	0	2
Other | Gain (loss) reclassified from AOCI to income
Total
Income taxes reclassified into net earnings	$ 0	$ 0	$ 0	$ 0