Stockholders' Equity and Accumulated Other Comprehensive Loss (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Components of and changes in accumulated other comprehensive loss, net of tax
Balance at beginning of the period	$ (440)	$ (410)
Other comprehensive income (loss) before reclassifications	(45)	(34)
Amounts reclassified from accumulated other comprehensive loss to net earnings	14	4
Other comprehensive income (loss), net of tax	(31)	(30)
Balance at end of the period	$ (471)	$ (440)	$ (410)
Common shares repurchased (in shares)	4,069	4,369
Repurchase of common stock	$ 13	$ 17	$ 5
Common stock dividend declared and paid (in dollars per share)	$ 9.00	$ 9.00	$ 6.00
Foreign currency translation adjustment
Components of and changes in accumulated other comprehensive loss, net of tax
Balance at beginning of the period	$ (369)	$ (349)
Other comprehensive income (loss) before reclassifications	(7)	(20)
Other comprehensive income (loss), net of tax	(7)	(20)
Balance at end of the period	(376)	(369)	$ (349)
Cumulative unrecognized pension cost
Components of and changes in accumulated other comprehensive loss, net of tax
Balance at beginning of the period	(71)	(61)
Other comprehensive income (loss) before reclassifications	(38)	(14)
Amounts reclassified from accumulated other comprehensive loss to net earnings	14	4
Other comprehensive income (loss), net of tax	(24)	(10)
Balance at end of the period	$ (95)	$ (71)	$ (61)
All components of AOCL except cumulative foreign currency translation adjustments
Components of and changes in accumulated other comprehensive loss, net of tax
Effective income tax rate (as a percent)	25.00%	26.00%	26.00%
Certain subsidiaries
Components of and changes in accumulated other comprehensive loss, net of tax
Unrecognized pension cost related to employees at certain subsidiaries	$ 34	$ 21	$ 23
Certain subsidiaries | Cumulative unrecognized pension cost
Components of and changes in accumulated other comprehensive loss, net of tax
Tax benefit recorded on unrecognized pension cost	$ 0	$ 0	$ 0