Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net Income	$ 4,767	$ 3,935	$ 3,205
Other comprehensive (loss) income:
Net change in derivative contracts	6	15	(29)
Net change in pension and other benefits	(170)	(113)	(98)
Net change in investments	0	0	142
Total Other Comprehensive (Loss) Income	(164)	(98)	15
Comprehensive Income	$ 4,603	$ 3,837	$ 3,220