Debt - Outstanding Amounts of Debt and Finance Leases (Details) - USD ($)	Mar. 31, 2023	Jan. 15, 2023	Dec. 31, 2022
Short-term debt
Other, including finance leases	$ 36,000,000		$ 33,000,000
Total short-term debt	3,418,000,000		2,993,000,000	[1]
Long-term debt
Other, including finance leases	67,000,000		66,000,000
Total long-term debt	29,124,000,000		28,100,000,000	[1]
$17 million, 8.3% Notes due January 2023
Short-term debt
Current maturities	0		17,000,000
Long-term debt
Gross value	$ 17,000,000
Interest Rate	8.30%
$63 million, 7.65% Notes due March 2023
Short-term debt
Current maturities	$ 0		63,000,000
Long-term debt
Gross value	$ 63,000,000
Interest Rate	7.65%
$700 million, Floating Rate Notes due July 2023
Short-term debt
Current maturities	$ 700,000,000		700,000,000
Long-term debt
Gross value	700,000,000
$1,000 million, 3% Notes due July 2023
Short-term debt
Current maturities	996,000,000		994,000,000
Long-term debt
Gross value	$ 1,000,000,000
Interest Rate	3.00%
$1,187 million, 3.75% Notes due July 2023
Short-term debt
Current maturities	$ 1,187,000,000		1,186,000,000
Long-term debt
Gross value	$ 1,187,000,000
Interest Rate	3.75%
$500 million, 0.613% Notes due March 2024
Short-term debt
Current maturities	$ 499,000,000		0
Long-term debt
Long-term debt	0		499,000,000
Gross value	$ 500,000,000
Interest Rate	0.613%
$1,000 million, 3.500% Notes due June 2024
Long-term debt
Long-term debt	$ 992,000,000		990,000,000
Gross value	$ 1,000,000,000
Interest Rate	3.50%
$900 million, 3.250% Notes due April 2025 (1)
Long-term debt
Long-term debt	$ 878,000,000		872,000,000
Gross value	$ 900,000,000
Interest Rate	3.25%
$2,200 million, 4.125% Notes due November 2025
Long-term debt
Long-term debt	$ 2,195,000,000		2,195,000,000
Gross value	$ 2,200,000,000
Interest Rate	4.125%
$1,500 million, 4.500% Notes due February 2026
Long-term debt
Long-term debt	$ 1,503,000,000		1,503,000,000
Gross value	$ 1,500,000,000
Interest Rate	4.50%
$800 million, 1.250% Notes due March 2026
Long-term debt
Long-term debt	$ 797,000,000		797,000,000
Gross value	$ 800,000,000
Interest Rate	1.25%
$700 million, 5.685% Notes due March 2026
Long-term debt
Long-term debt	$ 697,000,000		0
Gross value	$ 700,000,000
Interest Rate	5.685%
$1,500 million, 3.400% Notes due March 2027
Long-term debt
Long-term debt	$ 1,440,000,000		1,436,000,000
Gross value	$ 1,500,000,000
Interest Rate	3.40%
$259 million, 7.875% Debentures due May 2027
Long-term debt
Long-term debt	$ 259,000,000		259,000,000
Gross value	$ 259,000,000
Interest Rate	7.875%
$600 million, 3.050% Notes due October 2027
Long-term debt
Long-term debt	$ 597,000,000		597,000,000
Gross value	$ 600,000,000
Interest Rate	3.05%
$3,800 million, 4.375% Notes due October 2028
Long-term debt
Long-term debt	$ 3,785,000,000		3,785,000,000
Gross value	$ 3,800,000,000
Interest Rate	4.375%
$1,500 million, 2.400% Notes due March 2030
Long-term debt
Long-term debt	$ 1,492,000,000		1,492,000,000
Gross value	$ 1,500,000,000
Interest Rate	2.40%
$1,500 million, 2.375% Notes due 2031
Long-term debt
Long-term debt	$ 1,398,000,000		1,380,000,000
Gross value	$ 1,500,000,000
Interest Rate	2.375%
$45 million, 8.080% Step Down Notes due January 2033 (2)
Long-term debt
Long-term debt	$ 45,000,000		45,000,000
Gross value	$ 45,000,000
Interest Rate	8.08%	8.08%
$800 million, 5.400% Notes due March 2033
Long-term debt
Long-term debt	$ 794,000,000		0
Gross value	$ 800,000,000
Interest Rate	5.40%
$190 million, 6.150% Notes due November 2036
Long-term debt
Long-term debt	$ 190,000,000		190,000,000
Gross value	$ 190,000,000
Interest Rate	6.15%
$2,200 million, 4.800% Notes due August 2038
Long-term debt
Long-term debt	$ 2,192,000,000		2,192,000,000
Gross value	$ 2,200,000,000
Interest Rate	4.80%
$750 million, 3.200% Notes due March 2040
Long-term debt
Long-term debt	$ 743,000,000		743,000,000
Gross value	$ 750,000,000
Interest Rate	3.20%
$121 million, 5.875% Notes due March 2041
Long-term debt
Long-term debt	$ 119,000,000		119,000,000
Gross value	$ 121,000,000
Interest Rate	5.875%
$448 million, 6.125% Notes due November 2041
Long-term debt
Long-term debt	$ 488,000,000		488,000,000
Gross value	$ 448,000,000
Interest Rate	6.125%
$317 million, 5.375% Notes due February 2042
Long-term debt
Long-term debt	$ 315,000,000		315,000,000
Gross value	$ 317,000,000
Interest Rate	5.375%
$1,500 million, 4.800% Notes due July 2046
Long-term debt
Long-term debt	$ 1,466,000,000		1,466,000,000
Gross value	$ 1,500,000,000
Interest Rate	4.80%
$1,000 million, 3.875% Notes due October 2047
Long-term debt
Long-term debt	$ 989,000,000		989,000,000
Gross value	$ 1,000,000,000
Interest Rate	3.875%
$3,000 million, 4.900% Notes due December 2048
Long-term debt
Long-term debt	$ 2,969,000,000		2,968,000,000
Gross value	$ 3,000,000,000
Interest Rate	4.90%
$1,250 million, 3.400% Notes due March 2050
Long-term debt
Long-term debt	$ 1,236,000,000		1,236,000,000
Gross value	$ 1,250,000,000
Interest Rate	3.40%
$1,500 million, 3.400% Notes due March 2051
Long-term debt
Long-term debt	$ 1,478,000,000		$ 1,478,000,000
Gross value	$ 1,500,000,000
Interest Rate	3.40%

[1] Amounts have been restated to reflect the adoption of Targeted Improvements to the Accounting for Long-Duration Contracts in 2023. See Note 2 to the Consolidated Financial Statements for further information.