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Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Consolidated Statements of Comprehensive Income [Abstract]
Net income		$ 5,349	$ 5,919	$ 5,966
Other comprehensive income/(loss):
Defined benefit plans		(231)	42	62
Foreign currency translation		(6)	17	(36)
Total other comprehensive income/(loss)	[1]	(237)	59	26
Comprehensive income		$ 5,112	$ 5,978	$ 5,992
[1] Net of deferred taxes of $75 million, ($15) million, and ($22) million during 2020, 2019, and 2018, respectively.

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