Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Consolidated Statements of Comprehensive Income [Abstract]
Net income		$ 5,919	$ 5,966	$ 10,712
Other comprehensive income/(loss):
Defined benefit plans		42	62	103
Foreign currency translation		17	(36)	28
Total other comprehensive income/(loss)	[1]	59	26	131
Comprehensive income		$ 5,978	$ 5,992	$ 10,843

[1] Net of deferred taxes of ($15) million, ($22) million, and ($61) million during 2019, 2018, and 2017, respectively.