Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Millions		Mar. 31, 2022	Dec. 31, 2021
Debt Disclosure [Abstract]
Total borrowings at face value		$ 25,187	$ 28,493
Unamortized premium, net		660	670
Debt issuance costs		(114)	(135)
Net book value of debt		25,733	29,028
Long-term finance leases		540	504
Current finance leases		99	85
Total debt and finance leases		26,372	29,617
Less current maturities of financing leases		(99)	(85)
Less current maturities of long-term debt		(408)	(101)
Long-term debt, net	[1]	$ 25,865	$ 29,431

[1] Included $540 million and $504 million of finance lease liabilities as of March 31, 2022 and December 31, 2021, respectively.