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v3.19.2

Debt - Borrowings and Repayments (Detail) $ in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
May 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2019 CAD ($) | Jun. 30, 2018 USD ($) | May 01, 2019 USD ($)
Debt |  |  |  |  |  |  |
Debt repayments |  |  |  | $ 385 |  | $ 196 |
New borrowings |  |  |  | 3,971 |  | 83 |
Loss on early extinguishment of debt | $ (84) | $ (84) |  | (84) |  |  |
Net commercial borrowings (repayments) |  |  |  | (1,001) |  | $ 443 |
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt repayments |  |  |  | $ 11 | $ 15 |  |
Senior Notes, Aggregate [Member] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt instrument face amount | 4,000 |  |  |  |  |  |
New borrowings | 3,970 |  |  |  |  |  |
Amount of debt tendered, including interest | 344 |  |  |  |  |  |
Early extinguishment of high-coupon senior notes | 257 |  |  |  |  |  |
Accrued interest | 3 |  |  |  |  |  |
Senior Notes, Aggregate [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Interest rate (as a percent) |  | 2.40% |  | 2.40% | 2.40% |  |
Senior Notes, Aggregate [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Interest rate (as a percent) |  | 7.75% |  | 7.75% | 7.75% |  |
2.95% senior notes due June 2024 [Member] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt instrument face amount | $ 750 |  |  |  |  |  |
Interest rate (as a percent) | 2.95% |  |  |  |  |  |
Redemption price percentage | 101.00% |  |  |  |  |  |
3.20% senior notes due June 2026 [Member] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt instrument face amount | $ 750 |  |  |  |  |  |
Interest rate (as a percent) | 3.20% |  |  |  |  |  |
Redemption price percentage | 101.00% |  |  |  |  |  |
3.45% senior notes due June 2029 [Member] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt instrument face amount | $ 1,000 |  |  |  |  |  |
Interest rate (as a percent) | 3.45% |  |  |  |  |  |
Redemption price percentage | 101.00% |  |  |  |  |  |
4.00% senior notes due July 2039 [Member] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt instrument face amount | $ 500 |  |  |  |  |  |
Interest rate (as a percent) | 4.00% |  |  |  |  |  |
Redemption price percentage | 101.00% |  |  |  |  |  |
4.15% senior notes due July 2049 [Member] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt instrument face amount | $ 1,000 |  |  |  |  |  |
Interest rate (as a percent) | 4.15% |  |  |  |  |  |
7.10% senior notes due 2026 [Member] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt repayments | $ 56 |  |  |  |  |  |
Interest rate (as a percent) | 7.10% |  |  |  |  |  |
Face amount of tender offer |  |  |  |  |  |  | $ 304
7.00% senior notes due 2028 [Member] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt repayments | $ 64 |  |  |  |  |  |
Interest rate (as a percent) | 7.00% |  |  |  |  |  |
Face amount of tender offer |  |  |  |  |  |  | 395
7.375% senior notes due 2029 [Member] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt repayments | $ 58 |  |  |  |  |  |
Interest rate (as a percent) | 7.375% |  |  |  |  |  |
Face amount of tender offer |  |  |  |  |  |  | 139
7.75% senior notes due 2032 [Member] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt repayments | $ 57 |  |  |  |  |  |
Interest rate (as a percent) | 7.75% |  |  |  |  |  |
Face amount of tender offer |  |  |  |  |  |  | 210
6.125% senior notes due 2039 [Member] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt repayments | $ 22 |  |  |  |  |  |
Interest rate (as a percent) | 6.125% |  |  |  |  |  |
Face amount of tender offer |  |  |  |  |  |  | $ 274
Commercial Paper Program [Member] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Net commercial borrowings (repayments) |  |  | $ 357 | $ 1,000 |  |  |
Tax Exempt Bonds [Member] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt repayments |  |  |  | $ 94 |  |  |
Tax Exempt Bonds [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Interest rate (as a percent) |  | 1.35% |  | 1.35% | 1.35% |  |
Tax Exempt Bonds [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Interest rate (as a percent) |  | 4.30% |  | 4.30% | 4.30% |  |
Financing leases and other [Member] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt repayments |  |  |  | $ 23 |  |  |
Non-cash financing lease incurred |  |  |  | $ 119 |  |  |
Financing leases and other [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Interest rate (as a percent) |  | 9.00% |  | 9.00% | 9.00% |  |

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