Borrowings - Long-Term Debt, Components (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Borrowings
Long-term debt, gross	$ 64,400	$ 56,112
Long-term debt excluding finance lease obligations	63,369	55,111
Less: net unamortized discount	829	824
Less: net unamortized debt issuance costs	198	168
Add: fair value adjustment	(90)	(176)
Total	63,283	54,943
Less: current maturities	6,912	5,059
Total long-term debt (excluding current portion)	56,371	49,884
United States of America, Dollars
Borrowings
Long-term debt, gross	40,569	35,813
Euro Member Countries, Euro
Borrowings
Long-term debt, gross	20,794	17,340
Maturing 2025 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 1,600	1,601
Debt instrument, weighted-average interest rate (as a percent)	5.10%
Maturing 2025 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 2,160	3,106
Debt instrument, weighted-average interest rate (as a percent)	1.90%
Maturing 2026 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 5,800	5,800
Debt instrument, weighted-average interest rate (as a percent)	3.70%
Maturing 2027 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 4,119	4,119
Debt instrument, weighted-average interest rate (as a percent)	3.30%
Maturing 2027 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 2,160	2,071
Debt instrument, weighted-average interest rate (as a percent)	2.30%
Maturing 2028 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 2,313	1,313
Debt instrument, weighted-average interest rate (as a percent)	4.80%
Maturing 2028 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 1,944	1,863
Debt instrument, weighted-average interest rate (as a percent)	0.70%
Maturing 2029 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 3,752	3,750
Debt instrument, weighted-average interest rate (as a percent)	3.60%
Maturing 2029 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 1,080	1,035
Debt instrument, weighted-average interest rate (as a percent)	1.50%
Maturing 2030 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 2,356	1,350
Debt instrument, weighted-average interest rate (as a percent)	3.20%
Maturing 2030 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 1,890	1,035
Debt instrument, weighted-average interest rate (as a percent)	1.70%
Maturing 2031 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 500	500
Debt instrument, weighted-average interest rate (as a percent)	4.80%
Maturing 2031 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 2,701	2,588
Debt instrument, weighted-average interest rate (as a percent)	2.70%
Maturing 2032 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 2,700	1,850
Debt instrument, weighted-average interest rate (as a percent)	4.60%
Maturing 2032 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 1,728	1,656
Debt instrument, weighted-average interest rate (as a percent)	0.70%
Maturing 2033 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 750	750
Debt instrument, weighted-average interest rate (as a percent)	4.80%
Maturing 2033 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 1,188	0
Debt instrument, weighted-average interest rate (as a percent)	3.20%
Maturing 2034 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 1,000	1,000
Debt instrument, weighted-average interest rate (as a percent)	4.90%
Maturing 2034 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 1,080	1,035
Debt instrument, weighted-average interest rate (as a percent)	1.30%
Maturing 2035 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 900	0
Debt instrument, weighted-average interest rate (as a percent)	5.20%
Maturing 2035 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 1,080	1,035
Debt instrument, weighted-average interest rate (as a percent)	3.80%
Maturing 2037 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 972	0
Debt instrument, weighted-average interest rate (as a percent)	3.50%
Maturing 2038 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 83	83
Debt instrument, weighted-average interest rate (as a percent)	8.00%
Maturing 2038 | United Kingdom, Pounds
Borrowings
Long-term debt, gross	$ 968	939
Debt instrument, weighted-average interest rate (as a percent)	4.90%
Maturing 2039 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 2,745	2,745
Debt instrument, weighted-average interest rate (as a percent)	4.50%
Maturing 2040 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 650	650
Debt instrument, weighted-average interest rate (as a percent)	2.90%
Maturing 2040 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 918	880
Debt instrument, weighted-average interest rate (as a percent)	1.20%
Maturing 2042 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 1,107	1,107
Debt instrument, weighted-average interest rate (as a percent)	4.00%
Maturing 2043 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 1,080	1,035
Debt instrument, weighted-average interest rate (as a percent)	4.00%
Maturing 2044 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 1,000	1,000
Debt instrument, weighted-average interest rate (as a percent)	5.30%
Maturing 2045 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 27	27
Debt instrument, weighted-average interest rate (as a percent)	7.00%
Maturing 2045 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 810	0
Debt instrument, weighted-average interest rate (as a percent)	3.80%
Maturing 2046 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 650	650
Debt instrument, weighted-average interest rate (as a percent)	4.70%
Maturing 2049 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 3,000	3,000
Debt instrument, weighted-average interest rate (as a percent)	4.30%
Maturing 2050 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 750	750
Debt instrument, weighted-average interest rate (as a percent)	3.00%
Maturing 2052 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 1,400	1,400
Debt instrument, weighted-average interest rate (as a percent)	4.20%
Maturing 2053 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 650	650
Debt instrument, weighted-average interest rate (as a percent)	5.10%
Maturing 2054 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 1,400	1,400
Debt instrument, weighted-average interest rate (as a percent)	5.30%
Maturing 2055 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 1,000	0
Debt instrument, weighted-average interest rate (as a percent)	5.70%
Maturing 2096 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 316	316
Debt instrument, weighted-average interest rate (as a percent)	7.10%
Maturing 2026-2028 | Japan, Yen
Borrowings
Long-term debt, gross	$ 849	808
Debt instrument, weighted-average interest rate (as a percent)	0.90%
Maturing 2025-2027 | Other currencies
Borrowings
Long-term debt, gross	$ 189	212
Debt instrument, weighted-average interest rate (as a percent)	13.80%
Finance Lease Obligations Maturing 2025-2034
Borrowings
Finance lease obligations	$ 1,031	$ 1,000
Finance lease obligations, interest rate (as a percent)	4.90%