Restructuring and Other Charges - Activity in Accrued Balances for Restructuring and Other Cost Reduction Programs (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period		$ 177	$ 212
Additional charges	$ 89	128	138	$ 275
Cash payments/utilization		(65)	(173)
Balance at end of period	240	240	177	212
Employee Related Costs
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period		51	87
Additional charges		76	81
Cash payments/utilization		(36)	(117)
Balance at end of period	91	91	51	87
Exit Costs
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period		126	125
Additional charges		51	53
Cash payments/utilization		(28)	(52)
Balance at end of period	149	149	126	125
Non-cash Charges
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period		0	0
Additional charges		1	4
Cash payments/utilization		(1)	(4)
Balance at end of period	$ 0	$ 0	$ 0	$ 0