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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 ($) | Dec. 31, 2004 USD ($)
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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 |  |

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