Borrowings - Long-Term Debt, Components (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Borrowings
Long-term debt, gross	$ 57,757	$ 57,598
Long-term debt excluding finance lease obligations	56,934	57,099
Less: net unamortized discount	844	838
Less: net unamortized debt issuance costs	179	154
Add: fair value adjustment	(204)	(60)
Total	56,531	56,546
Less: current maturities	3,601	6,425
Total long-term debt (excluding current portion)	52,929	50,121
United States of America, Dollars
Borrowings
Long-term debt, gross	35,817	35,317
Euro Member Countries, Euro
Borrowings
Long-term debt, gross	18,745	19,335
Maturing 2024 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 1	5,003
Debt instrument, weighted-average interest rate (as a percent)	3.40%
Maturing 2024 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 803	829
Debt instrument, weighted-average interest rate (as a percent)	1.10%
Maturing 2025 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 1,604	1,601
Debt instrument, weighted-average interest rate (as a percent)	5.10%
Maturing 2025 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 3,213	3,315
Debt instrument, weighted-average interest rate (as a percent)	1.60%
Maturing 2026 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 5,800	5,201
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	3,619
Debt instrument, weighted-average interest rate (as a percent)	3.30%
Maturing 2027 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 2,142	2,210
Debt instrument, weighted-average interest rate (as a percent)	2.30%
Maturing 2028 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 1,313	1,313
Debt instrument, weighted-average interest rate (as a percent)	5.00%
Maturing 2028 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 1,928	1,989
Debt instrument, weighted-average interest rate (as a percent)	0.70%
Maturing 2029 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 3,750	3,250
Debt instrument, weighted-average interest rate (as a percent)	3.60%
Maturing 2029 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 1,071	1,105
Debt instrument, weighted-average interest rate (as a percent)	1.50%
Maturing 2030 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 1,350	1,350
Debt instrument, weighted-average interest rate (as a percent)	2.00%
Maturing 2030 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 1,071	1,105
Debt instrument, weighted-average interest rate (as a percent)	0.90%
Maturing 2031 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 500	0
Debt instrument, weighted-average interest rate (as a percent)	4.80%
Maturing 2031 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 2,678	2,762
Debt instrument, weighted-average interest rate (as a percent)	2.70%
Maturing 2032 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 1,850	1,850
Debt instrument, weighted-average interest rate (as a percent)	4.40%
Maturing 2032 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 1,714	1,768
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 2034 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 1,000	0
Debt instrument, weighted-average interest rate (as a percent)	4.90%
Maturing 2034 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 1,071	1,105
Debt instrument, weighted-average interest rate (as a percent)	1.30%
Maturing 2035 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 1,071	1,105
Debt instrument, weighted-average interest rate (as a percent)	3.80%
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	$ 948	955
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	$ 910	939
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 2044 | United States of America, Dollars
Borrowings
Long-term debt, gross	$ 1,000	0
Debt instrument, weighted-average interest rate (as a percent)	5.30%
Maturing 2043 | Euro Member Countries, Euro
Borrowings
Long-term debt, gross	$ 1,071	1,105
Debt instrument, weighted-average interest rate (as a percent)	4.00%
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 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	0
Debt instrument, weighted-average interest rate (as a percent)	5.30%
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 2024-2028 | Japan, Yen
Borrowings
Long-term debt, gross	$ 1,097	1,251
Debt instrument, weighted-average interest rate (as a percent)	0.50%
Maturing 2024-2027 | Other currencies
Borrowings
Long-term debt, gross	$ 327	241
Debt instrument, weighted-average interest rate (as a percent)	12.90%
Finance Lease Obligations Maturing 2024-2034
Borrowings
Finance lease obligations	$ 823	$ 499
Finance lease obligations, interest rate (as a percent)	5.00%