Debt - Repayments of Principal and Interest (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Total secured and unsecured debt, carrying amount	$ 105,327	$ 96,854
Interest payments in 2024	3,916
Interest payments in 2025	2,356
Interest payments in 2026	1,470
Interest payments in 2027	921
Interest payments in 2028	602
Interest payments thereafter	847
Interest payments	10,113
Total repayments in 2024	42,554
Total repayments in 2025	25,327
Total repayments in 2026	16,519
Total repayments in 2027	9,691
Total repayments in 2028	7,766
Total repayments thereafter	14,846
Total repayments of principal and interest	116,703
Secured Debt
Debt Instrument [Line Items]
Repayments of principal in 2024	22,091
Repayments of principal in 2025	11,886
Repayments of principal in 2026	6,358
Repayments of principal in 2027	1,630
Repayments of principal in 2028	1,162
Repayments of principal thereafter	2,176
Total secured and unsecured debt, carrying amount	45,301
Unsecured Debt
Debt Instrument [Line Items]
Repayments of principal in 2024	16,546
Repayments of principal in 2025	11,086
Repayments of principal in 2026	8,691
Repayments of principal in 2027	7,140
Repayments of principal in 2028	6,002
Repayments of principal thereafter	11,823
Total secured and unsecured debt, carrying amount	$ 61,289