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Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Retirement Benefits [Abstract]
Interest cost	$ (24)	$ (29)	$ (72)	$ (85)
Expected return on plan assets	40	39	124	116
Remeasurement gain (loss), net	(31)	(125)	124	(125)
Net periodic pension benefits (costs)	$ (15)	$ (115)	$ 176	$ (94)

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