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Debt and Interest Rate Derivatives - Borrowings and Repayments (Detail) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 20, 2020 | May 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jul. 01, 2020 | Dec. 31, 2019
Debt |  |  |  |  |  |  |  |
Net commercial paper borrowings (repayments) |  |  |  |  | $ 597 | $ (1,001) |  |
Debt repayments |  |  |  |  | 3,942 | 502 |  |
New borrowings |  |  |  |  | 231 | 4,558 |  |
Premiums paid on early extinguishment of debt |  |  |  |  | 30 | 84 |  |
Loss on early extinguishment of debt |  |  | $ (52) | $ (1) | (52) | $ (85) |  |
Debt issuance costs, discounts and other |  |  | 60 |  | 60 |  |  | $ 85
Commercial Paper Program [Member] |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Net commercial paper borrowings (repayments) |  |  | $ 597 |  |  |  |  |
4.75% senior notes due June 2020 [Member] |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Debt repayments |  |  |  |  | $ 600 |  |  |
Interest rate (as a percent) |  |  | 4.75% |  | 4.75% |  |  |
Senior Notes, Aggregate [Member] |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
New borrowings |  | $ 4,000 |  |  |  |  |  |
Senior Notes, Aggregate [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 2.40% |  | 2.40% |  |  |
Senior Notes, Aggregate [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 7.75% |  | 7.75% |  |  |
Senior Notes, Mandatory Redemption Feature [Member] |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Debt repayments | $ 3,000 |  |  |  |  |  |  |
New borrowings |  | $ 3,000 |  |  |  |  |  |
Aggregate principal amounts of notes redeemed (as a percent) |  | 101.00% |  |  |  |  |  |
Premiums paid on early extinguishment of debt | 30 |  | $ 30 |  |  |  |  |
Interest Payable, Current | $ 8 |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  | $ (52) |  |  |  |  |
Debt issuance costs, discounts and other |  |  |  |  |  |  | $ 22 |
Canadian Senior Notes [Member] |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 2.60% |  | 2.60% |  |  |
Tax Exempt Bonds [Member] |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Debt repayments |  |  |  |  | $ 82 |  |  |
New borrowings |  |  |  |  | 51 |  |  |
Debt refunded and reissued |  |  | $ 130 |  | $ 130 |  |  |
Tax Exempt Bonds [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 0.17% |  | 0.17% |  |  |
Tax Exempt Bonds [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 4.30% |  | 4.30% |  |  |
Financing leases and other [Member] |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Debt repayments |  |  |  |  | $ 80 |  |  |
New borrowings |  |  |  |  | $ 21 |  |  |

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