Long-Term Debt and Short-Term Borrowings - Long-Term Debt (Details) € in Millions	Dec. 31, 2023 USD ($)	Dec. 31, 2023 EUR (€)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2004 USD ($)
Long-Term Debt
Effective Interest Rate
Total long-term debt	$ 14,240,000,000		$ 15,939,000,000
Less: current portion of long-term debt	1,152,000,000		1,938,000,000
Long-term debt (excluding current portion)	$ 13,088,000,000		14,001,000,000
Fixed rate registered note due 2023
Long-Term Debt
Effective Interest Rate	0.00%	0.00%
Total long-term debt	$ 0		500,000,000
Fixed rate medium term notes due 2023
Long-Term Debt
Effective Interest Rate	0.00%	0.00%
Total long-term debt	$ 0		650,000,000
Fixed rate Euro medium term note due 2023
Long-Term Debt
Effective Interest Rate	0.00%	0.00%
Total long-term debt	$ 0		639,000,000
Fixed rate medium term notes due 2024
Long-Term Debt
Principal amount	$ 300,000,000
Effective Interest Rate	3.30%	3.30%
Total long-term debt	$ 300,000,000		300,000,000
Fixed rate medium term notes due 2024
Long-Term Debt
Principal amount	$ 500,000,000
Effective Interest Rate	2.98%	2.98%
Total long-term debt	$ 500,000,000		501,000,000
Floating rate medium term notes due 2024
Long-Term Debt
Principal amount	$ 300,000,000
Effective Interest Rate	5.96%	5.96%
Total long-term debt	$ 300,000,000		300,000,000
Fixed rate registered note due 2025
Long-Term Debt
Principal amount	$ 750,000,000
Effective Interest Rate	2.12%	2.12%
Total long-term debt	$ 748,000,000		747,000,000
Fixed rate registered note due 2025
Long-Term Debt
Principal amount	$ 500,000,000
Effective Interest Rate	2.67%	2.67%
Total long-term debt	$ 499,000,000		499,000,000
Fixed rate medium term note due 2025
Long-Term Debt
Principal amount	$ 550,000,000
Effective Interest Rate	3.04%	3.04%
Total long-term debt	$ 549,000,000		549,000,000
Fixed rate medium term note due 2026
Long-Term Debt
Principal amount	$ 650,000,000
Effective Interest Rate	2.37%	2.37%
Total long-term debt	$ 647,000,000		646,000,000
Fixed rate Euro medium term note due 2026
Long-Term Debt
Principal amount | €		€ 750
Effective Interest Rate	1.65%	1.65%
Total long-term debt	$ 821,000,000		792,000,000
Floating rate note due 2027
Long-Term Debt
Principal amount	$ 19,000,000
Effective Interest Rate	5.22%	5.22%
Total long-term debt	$ 18,000,000		18,000,000
Fixed rate medium term notes due 2027
Long-Term Debt
Principal amount	$ 850,000,000
Effective Interest Rate	2.95%	2.95%
Total long-term debt	$ 846,000,000		845,000,000
Fixed rate 30-year debenture due 2028
Long-Term Debt
Principal amount	$ 220,000,000
Effective Interest Rate	6.44%	6.44%
Total long-term debt	$ 223,000,000		223,000,000
Floating rate note due 2028
Long-Term Debt
Principal amount	$ 150,000,000
Effective Interest Rate	8.08%	8.08%
Total long-term debt	$ 131,000,000		129,000,000
Floating rate note due 2028
Long-Term Debt
Principal amount	$ 150,000,000
Effective Interest Rate	8.03%	8.03%
Total long-term debt	$ 132,000,000		129,000,000
Floating rate note due 2028
Long-Term Debt
Principal amount	$ 250,000,000
Effective Interest Rate	7.62%	7.62%
Total long-term debt	$ 216,000,000		211,000,000
Floating rate note due 2028
Long-Term Debt
Principal amount	$ 150,000,000
Effective Interest Rate	7.57%	7.57%
Total long-term debt	$ 130,000,000		127,000,000
Floating rate note due 2028
Long-Term Debt
Principal amount	$ 100,000,000
Effective Interest Rate	7.66%	7.66%
Total long-term debt	$ 86,000,000		84,000,000
Fixed rate medium term note due 2028
Long-Term Debt
Principal amount	$ 300,000,000
Effective Interest Rate	3.62%	3.62%
Total long-term debt	$ 598,000,000		598,000,000
Fixed rate medium term note due 2029
Long-Term Debt
Principal amount	$ 800,000,000
Effective Interest Rate	3.38%	3.38%
Total long-term debt	$ 798,000,000		797,000,000
Fixed rate registered note due 2029
Long-Term Debt
Principal amount	$ 1,000,000,000
Effective Interest Rate	2.50%	2.50%
Total long-term debt	$ 991,000,000		989,000,000
Fixed rate registered note due 2030
Long-Term Debt
Principal amount	$ 600,000,000
Effective Interest Rate	3.09%	3.09%
Total long-term debt	$ 597,000,000		596,000,000
Fixed rate Euro medium term note due 2030
Long-Term Debt
Principal amount	$ 500,000,000
Effective Interest Rate	1.90%	1.90%
Total long-term debt	$ 546,000,000		526,000,000
Fixed rate Euro medium term notes due 2031
Long-Term Debt
Principal amount | €		€ 500
Effective Interest Rate	1.54%	1.54%
Total long-term debt	$ 549,000,000		530,000,000
Fixed rate 30-year bond due 2037
Long-Term Debt
Principal amount	$ 555,000,000
Effective Interest Rate	5.73%	5.73%
Total long-term debt	$ 552,000,000		552,000,000
Floating rate note due 2040
Long-Term Debt
Principal amount	$ 52,000,000
Effective Interest Rate	5.31%	5.31%
Total long-term debt	$ 52,000,000		52,000,000
Floating rate note due 2041
Long-Term Debt
Principal amount	$ 95,000,000
Effective Interest Rate	5.31%	5.31%
Total long-term debt	$ 94,000,000		96,000,000
Fixed rate medium term note due 2044
Long-Term Debt
Principal amount	$ 325,000,000
Effective Interest Rate	4.05%	4.05%
Total long-term debt	$ 316,000,000		315,000,000
Floating rate note due 2044
Long-Term Debt
Principal amount	$ 53,000,000				$ 60,000,000
Effective Interest Rate	5.31%	5.31%
Total long-term debt	$ 53,000,000		53,000,000
Fixed rate medium term note due 2046
Long-Term Debt
Principal amount	$ 500,000,000
Effective Interest Rate	3.37%	3.37%
Total long-term debt	$ 479,000,000		478,000,000
Fixed rate medium term note due 2047
Long-Term Debt
Principal amount	$ 500,000,000
Effective Interest Rate	3.68%	3.68%
Total long-term debt	$ 493,000,000		492,000,000
Fixed rate medium term note due 2048
Long-Term Debt
Principal amount	$ 650,000,000
Effective Interest Rate	4.07%	4.07%
Total long-term debt	$ 639,000,000		638,000,000
Fixed rate medium term note due 2048
Long-Term Debt
Principal amount	$ 500,000,000
Effective Interest Rate	3.78%	3.78%
Total long-term debt	$ 504,000,000		504,000,000
Fixed rate registered note due 2049
Long-Term Debt
Principal amount	$ 500,000,000			$ 1,000,000,000
Effective Interest Rate	3.37%	3.37%
Total long-term debt	$ 486,000,000		486,000,000
Fixed rate registered note due 2050
Long-Term Debt
Principal amount	$ 350,000,000			$ 650,000,000
Effective Interest Rate	3.72%	3.72%
Total long-term debt	$ 346,000,000		346,000,000
Other borrowings
Long-Term Debt
Effective Interest Rate	0.11%	0.11%
Total long-term debt	$ 1,000,000		$ 2,000,000