Financing and Leases - Schedule of Shares Used to Compute Diluted Earnings Per Share (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Debt Disclosure [Abstract]
As reported shares (in shares)	1,065	1,061	1,064	1,060
Effect of stock-based compensation (in shares)	5	6	5	6
Effect of equity units (in shares)	2	0	1	0
Diluted (in shares)	1,072	1,067	1,070	1,066