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Long-Term Debt and Short-Term Borrowings - Long-Term Debt (Details) € in Millions, XUA in Millions, $ in Millions | Dec. 31, 2021 USD ($) | Dec. 31, 2021 EUR (€) | Dec. 31, 2021 XUA | Sep. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Aug. 31, 2019 USD ($) | Feb. 28, 2019 USD ($) | Dec. 31, 2004 USD ($)
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Long-Term Debt |  |  |  |  |  |  |  |  |
Other borrowings | $ 17,347 |  |  |  |  | $ 18,783 |  |  |
Less: current portion of long-term debt | 1,291 |  |  |  |  | 794 |  |  |
Long-term debt (excluding current portion) | $ 16,056 |  |  |  |  | 17,989 |  |  |
Fixed rate Eurobond due 2021 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Effective Interest Rate | 0.00% | 0.00% | 0.00% |  |  |  |  |  |
Other borrowings | $ 0 |  |  |  |  | 367 |  |  |
Floating rate Eurobond due 2021 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Effective Interest Rate | 0.00% | 0.00% | 0.00% |  |  |  |  |  |
Other borrowings | $ 0 |  |  |  |  | 374 |  |  |
Fixed rate medium term note due 2021 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Effective Interest Rate | 0.00% | 0.00% | 0.00% |  |  |  |  |  |
Other borrowings | $ 0 |  |  |  |  | 449 |  |  |
Fixed rate Euro medium term note due 2022 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | € |  | € 500 |  |  |  |  |  |  |
Effective Interest Rate | 0.45% | 0.45% | 0.45% |  |  |  |  |  |
Other borrowings | $ 567 |  |  |  |  | 612 |  |  |
Fixed rate medium term note due 2022 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 600 |  |  |  |  |  |  | $ 450 |
Effective Interest Rate | 2.17% | 2.17% | 2.17% |  |  |  |  | 2.75% |
Other borrowings | $ 599 |  |  |  |  | 598 |  |  |
Fixed rate Euro medium term note due 2023 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | € |  | € 600 |  |  |  |  |  |  |
Effective Interest Rate | 1.14% | 1.14% | 1.14% |  |  |  |  |  |
Other borrowings | $ 679 |  |  |  |  | 731 |  |  |
Fixed rate registered note due 2023 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 500 |  |  |  |  |  | $ 500 |  |
Effective Interest Rate | 1.86% | 1.86% | 1.86% |  |  |  | 1.75% |  |
Other borrowings | $ 499 |  |  |  |  | 498 |  |  |
Fixed rate medium term notes due 2023 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 650 |  |  |  |  |  |  |  |
Effective Interest Rate | 2.26% | 2.26% | 2.26% |  |  |  |  |  |
Other borrowings | $ 649 |  |  |  |  | 649 |  |  |
Fixed rate medium term notes due 2024 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 300 |  |  |  |  |  |  |  |
Effective Interest Rate | 3.30% | 3.30% | 3.30% |  |  |  |  |  |
Other borrowings | $ 299 |  |  |  |  | 299 |  |  |
Fixed rate medium term notes due 2024 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 500 |  |  |  |  |  |  | $ 500 |
Effective Interest Rate | 2.98% | 2.98% | 2.98% |  |  |  |  | 3.25% |
Other borrowings | $ 501 |  |  |  |  | 502 |  |  |
Floating rate medium term notes due 2024 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 300 |  |  |  |  |  |  |  |
Effective Interest Rate | 0.42% | 0.42% | 0.42% |  |  |  |  |  |
Other borrowings | $ 300 |  |  |  |  | 299 |  |  |
Fixed rate medium term note due 2025 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 550 |  |  |  |  |  |  |  |
Effective Interest Rate | 3.04% | 3.04% | 3.04% |  |  |  |  |  |
Other borrowings | $ 548 |  |  |  |  | 548 |  |  |
Fixed rate registered note due 2025 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 750 |  |  |  | $ 500 |  | $ 750 |  |
Effective Interest Rate | 2.12% | 2.12% | 2.12% |  | 2.65% |  | 2.00% |  |
Other borrowings | $ 746 |  |  |  |  | 744 |  |  |
Fixed rate registered note due 2025 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 500 |  |  |  |  |  |  |  |
Effective Interest Rate | 2.67% | 2.67% | 2.67% |  |  |  |  |  |
Other borrowings | $ 498 |  |  |  |  | 498 |  |  |
Fixed rate Euro medium term note due 2026 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | € |  | € 750 |  |  |  |  |  |  |
Effective Interest Rate | 1.65% | 1.65% | 1.65% |  |  |  |  |  |
Other borrowings | $ 842 |  |  |  |  | 908 |  |  |
Fixed rate medium term notes due 2026 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 650 |  |  |  |  |  |  |  |
Effective Interest Rate | 2.37% | 2.37% | 2.37% |  |  |  |  |  |
Other borrowings | $ 645 |  |  |  |  | 644 |  |  |
Fixed rate medium term notes due 2027 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 850 |  |  |  |  |  |  |  |
Effective Interest Rate | 2.95% | 2.95% | 2.95% |  |  |  |  |  |
Other borrowings | $ 844 |  |  |  |  | 843 |  |  |
Floating Rate Note Due2027 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 19 |  |  |  |  |  |  |  |
Effective Interest Rate | 0.00% | 0.00% | 0.00% |  |  |  |  |  |
Other borrowings | $ 19 |  |  |  |  | 19 |  |  |
Fixed rate 30-year debenture due 2028 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 220 |  |  |  |  |  |  |  |
Effective Interest Rate | 6.44% | 6.44% | 6.44% |  |  |  |  |  |
Other borrowings | $ 224 |  |  |  |  | 225 |  |  |
Floating Rate Note Due 2028 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 250 |  |  |  |  |  |  |  |
Effective Interest Rate | 2.07% | 2.07% | 2.07% |  |  |  |  |  |
Other borrowings | $ 240 |  |  |  |  | 0 |  |  |
Floating Rate Note Due 2028 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 150 |  |  |  |  |  |  |  |
Effective Interest Rate | 2.02% | 2.02% | 2.02% |  |  |  |  |  |
Other borrowings | $ 144 |  |  |  |  | 0 |  |  |
Floating Rate Note Due 2028 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 100 |  |  |  |  |  |  |  |
Effective Interest Rate | 2.11% | 2.11% | 2.11% |  |  |  |  |  |
Other borrowings | $ 96 |  |  |  |  | 0 |  |  |
Fixed rate medium term notes due 2028 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 600 |  |  |  |  |  |  |  |
Effective Interest Rate | 3.62% | 3.62% | 3.62% |  |  |  |  |  |
Other borrowings | $ 598 |  |  |  |  | 598 |  |  |
Floating Rate Note Due 2028 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 150 |  |  |  |  |  |  |  |
Effective Interest Rate | 2.53% | 2.53% | 2.53% |  |  |  |  |  |
Other borrowings | $ 147 |  |  |  |  | 0 |  |  |
Floating Rate Note Due 2028 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 150 |  |  |  |  |  |  |  |
Effective Interest Rate | 2.48% | 2.48% | 2.48% |  |  |  |  |  |
Other borrowings | $ 147 |  |  |  |  | 0 |  |  |
Fixed rate registered note due 2029 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 1,000 |  |  |  |  |  | $ 1,000 |  |
Effective Interest Rate | 2.50% | 2.50% | 2.50% |  |  |  | 2.375% |  |
Other borrowings | $ 988 |  |  |  |  | 986 |  |  |
Fixed rate medium term notes due 2029 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 800 |  |  |  |  |  |  | $ 800 |
Effective Interest Rate | 3.38% | 3.38% | 3.38% |  |  |  |  | 3.375% |
Other borrowings | $ 797 |  |  |  |  | 796 |  |  |
Fixed rate Euro medium term note due 2030 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | XUA |  |  | XUA 500 |  |  |  |  |  |
Effective Interest Rate | 1.90% | 1.90% | 1.90% |  |  |  |  |  |
Other borrowings | $ 560 |  |  |  |  | 604 |  |  |
Fixed rate registered note due 2030 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 600 |  |  |  | $ 600 |  |  |  |
Effective Interest Rate | 3.09% | 3.09% | 3.09% |  | 3.05% |  |  |  |
Other borrowings | $ 596 |  |  |  |  | 595 |  |  |
Fixed rate Euro medium term notes due 2031 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | € |  | € 500 |  |  |  |  |  |  |
Effective Interest Rate | 1.54% | 1.54% | 1.54% |  |  |  |  |  |
Other borrowings | $ 563 |  |  |  |  | 608 |  |  |
Fixed rate 30-year bond due 2037 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 555 |  |  |  |  |  |  |  |
Effective Interest Rate | 5.73% | 5.73% | 5.73% |  |  |  |  |  |
Other borrowings | $ 551 |  |  |  |  | 551 |  |  |
Floating Rate Note Due 2040 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 52 |  |  |  |  |  |  |  |
Effective Interest Rate | 0.00% | 0.00% | 0.00% |  |  |  |  |  |
Other borrowings | $ 52 |  |  |  |  | 51 |  |  |
Floating rate note due 2041 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 96 |  |  |  |  |  |  |  |
Effective Interest Rate | 0.00% | 0.00% | 0.00% |  |  |  |  |  |
Other borrowings | $ 96 |  |  |  |  | 96 |  |  |
Fixed rate medium term note due 2044 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 325 |  |  |  |  |  |  |  |
Effective Interest Rate | 4.05% | 4.05% | 4.05% |  |  |  |  |  |
Other borrowings | $ 315 |  |  |  |  | 315 |  |  |
Floating rate note due 2044 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 54 |  |  |  |  |  |  |  | $ 60
Effective Interest Rate | 0.00% | 0.00% | 0.00% |  |  |  |  |  |
Other borrowings | $ 53 |  |  |  |  | 53 |  |  |
Fixed rate medium term note due 2046 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 500 |  |  |  |  |  |  |  |
Effective Interest Rate | 3.37% | 3.37% | 3.37% |  |  |  |  |  |
Other borrowings | $ 477 |  |  |  |  | 476 |  |  |
Fixed rate medium term note due 2047 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 500 |  |  |  |  |  |  |  |
Effective Interest Rate | 3.68% | 3.68% | 3.68% |  |  |  |  |  |
Other borrowings | $ 492 |  |  |  |  | 492 |  |  |
Fixed rate medium term note due 2048 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 650 |  |  |  |  |  |  |  |
Effective Interest Rate | 4.07% | 4.07% | 4.07% |  |  |  |  |  |
Other borrowings | $ 638 |  |  |  |  | 637 |  |  |
Fixed rate medium term note due 2048 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 500 |  |  |  |  |  |  | $ 500 |
Effective Interest Rate | 3.78% | 3.78% | 3.78% |  |  |  |  | 4.00% |
Other borrowings | $ 505 |  |  |  |  | 505 |  |  |
Fixed rate registered note due 2049 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 500 |  |  | $ 1,000 |  |  | $ 1,000 |  |
Effective Interest Rate | 3.37% | 3.37% | 3.37% |  |  |  | 3.25% |  |
Other borrowings | $ 485 |  |  |  |  | 969 |  |  |
Fixed rate registered note due 2050 |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Principal amount | $ 350 |  |  | $ 650 | $ 650 |  |  |  |
Effective Interest Rate | 3.72% | 3.72% | 3.72% |  | 3.70% |  |  |  |
Other borrowings | $ 346 |  |  |  |  | 642 |  |  |
Other borrowings |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Effective Interest Rate | 0.19% | 0.19% | 0.19% |  |  |  |  |  |
Other borrowings | $ 2 |  |  |  |  | $ 2 |  |  |

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