Borrowings - Long-Term Debt, Components (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Borrowings
Long-term debt, gross	$ 66,337	$ 62,286
Long-term debt excluding finance lease obligations	65,198	61,134
Less: net unamortized discount	809	806
Less: net unamortized debt issuance costs	203	185
Add: fair value adjustment	(65)	(36)
Total	65,260	61,259
Less: current maturities	7,554	6,424
Total long-term debt (excluding current portion)	57,706	54,836
United States of America, Dollars
Borrowings
Long-term debt, gross	39,456	38,979
Euro Member Countries, Euro
Borrowings
Long-term debt, gross	23,901	20,258
Maturing 2026 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 3,000	5,800
Debt instrument, weighted-average interest rate (as a percent)	3.30%
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	$ 2,304	2,349
Debt instrument, weighted-average interest rate (as a percent)	2.30%
Maturing 2028 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 2,318	2,319
Debt instrument, weighted-average interest rate (as a percent)	4.80%
Maturing 2028 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 2,937	2,114
Debt instrument, weighted-average interest rate (as a percent)	1.10%
Maturing 2029 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 4,256	3,757
Debt instrument, weighted-average interest rate (as a percent)	3.70%
Maturing 2029 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 1,152	1,174
Debt instrument, weighted-average interest rate (as a percent)	1.50%
Maturing 2030 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 2,384	2,355
Debt instrument, weighted-average interest rate (as a percent)	3.20%
Maturing 2030 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 2,016	2,055
Debt instrument, weighted-average interest rate (as a percent)	1.70%
Maturing 2031 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 1,000	500
Debt instrument, weighted-average interest rate (as a percent)	4.50%
Maturing 2031 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 4,031	2,936
Debt instrument, weighted-average interest rate (as a percent)	2.80%
Maturing 2032 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 2,700	2,700
Debt instrument, weighted-average interest rate (as a percent)	4.60%
Maturing 2032 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 1,843	1,879
Debt instrument, weighted-average interest rate (as a percent)	0.70%
Maturing 2033 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 1,250	750
Debt instrument, weighted-average interest rate (as a percent)	4.70%
Maturing 2033 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 1,267	1,292
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	$ 2,304	1,174
Debt instrument, weighted-average interest rate (as a percent)	2.40%
Maturing 2035 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 900	900
Debt instrument, weighted-average interest rate (as a percent)	5.20%
Maturing 2035 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 1,152	1,174
Debt instrument, weighted-average interest rate (as a percent)	3.80%
Maturing 2036 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 1,000	0
Debt instrument, weighted-average interest rate (as a percent)	5.00%
Maturing 2037 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 1,037	1,057
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 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 864	0
Debt instrument, weighted-average interest rate (as a percent)	3.90%
Maturing 2038 | United Kingdom, Pounds
Borrowings
Long-term debt, gross	$ 990	1,009
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	$ 979	998
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	$ 1,152	1,174
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	$ 864	881
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	1,000
Debt instrument, weighted-average interest rate (as a percent)	5.70%
Maturing 2056 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 750	0
Debt instrument, weighted-average interest rate (as a percent)	5.80%
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	$ 798	811
Debt instrument, weighted-average interest rate (as a percent)	1.20%
Maturing 2026-2027 | Other currencies
Borrowings
Long-term debt, gross	$ 53	78
Debt instrument, weighted-average interest rate (as a percent)	13.70%
Finance Lease Obligations Maturing 2026-2035
Borrowings
Finance lease obligations	$ 1,139	$ 1,153
Finance lease obligations, interest rate (as a percent)	5.10%
2024 U.S. Dollar Fixed Rate Notes | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 4,900