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v3.20.4

Capital Structure - Total debt outstanding (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Nov. 19, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |
Due after one year through five years | $ 1,600,000,000 |  | $ 1,000,000,000
Due after five years through ten years | 1,150,000,000 |  | 550,000,000
Due after ten years | 5,141,000,000 |  | 5,141,000,000
Total long-term debt principal | 7,891,000,000 |  | 6,691,000,000
Debt issuance costs | (66,000,000) |  | (60,000,000)
Total long-term debt | 7,825,000,000 |  | 6,631,000,000
Short-term debt | 0 |  | 0
Total debt | $ 7,825,000,000 |  | 6,631,000,000
Redemption price as percentage of principal amount plus accrued and unpaid interest | 100.00% |  |
Floating Rate Senior Notes, due 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Due after one year through five years | $ 250,000,000 |  | 250,000,000
Interest rate spread over LIBOR (as a percent) | 0.43% |  |
Floating Rate Senior Notes, due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Due after one year through five years | $ 250,000,000 |  | 250,000,000
Interest rate spread over LIBOR (as a percent) | 0.63% |  |
3.15% Senior Notes, due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Due after one year through five years | $ 500,000,000 |  | 500,000,000
Note stated interest rate (as a percent) | 3.15% |  |
0.75% Senior Notes, due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Due after one year through five years | $ 600,000,000 |  | 0
Total long-term debt |  | $ 600,000,000 |
Note stated interest rate (as a percent) | 0.75% | 0.75% |
3.28% Senior Notes, due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Due after five years through ten years | $ 550,000,000 |  | 550,000,000
Note stated interest rate (as a percent) | 3.28% |  |
1.45% Senior Notes, due 2030 |  |  |
Debt Instrument [Line Items] |  |  |
Due after five years through ten years | $ 600,000,000 |  | 0
Total long-term debt |  | $ 600,000,000 |
Note stated interest rate (as a percent) | 1.45% | 1.45% |
6.125% Senior Notes, due 2032 |  |  |
Debt Instrument [Line Items] |  |  |
Due after ten years | $ 159,000,000 |  | 159,000,000
Note stated interest rate (as a percent) | 6.125% |  |
5.35% Senior Notes due 2033 |  |  |
Debt Instrument [Line Items] |  |  |
Due after ten years | $ 323,000,000 |  | 323,000,000
Note stated interest rate (as a percent) | 5.35% |  |
5.55% Senior Notes due 2035 |  |  |
Debt Instrument [Line Items] |  |  |
Due after ten years | $ 546,000,000 |  | 546,000,000
Note stated interest rate (as a percent) | 5.55% |  |
5.95% Senior Notes, due 2036 |  |  |
Debt Instrument [Line Items] |  |  |
Due after ten years | $ 386,000,000 |  | 386,000,000
Note stated interest rate (as a percent) | 5.95% |  |
6.900% Senior Debentures, due 2038 |  |  |
Debt Instrument [Line Items] |  |  |
Due after ten years | $ 165,000,000 |  | 165,000,000
Note stated interest rate (as a percent) | 6.90% |  |
5.20% Senior Notes due 2042 |  |  |
Debt Instrument [Line Items] |  |  |
Due after ten years | $ 62,000,000 |  | 62,000,000
Note stated interest rate (as a percent) | 5.20% |  |
4.50% Senior Notes, due 2043 |  |  |
Debt Instrument [Line Items] |  |  |
Due after ten years | $ 500,000,000 |  | 500,000,000
Note stated interest rate (as a percent) | 4.50% |  |
4.20% Senior Notes, due 2046 |  |  |
Debt Instrument [Line Items] |  |  |
Due after ten years | $ 700,000,000 |  | 700,000,000
Note stated interest rate (as a percent) | 4.20% |  |
3.85% Senior Notes, due 2049 |  |  |
Debt Instrument [Line Items] |  |  |
Due after ten years | $ 500,000,000 |  | 500,000,000
Note stated interest rate (as a percent) | 3.85% |  |
5.100% Subordinated Debentures, due 2053 |  |  |
Debt Instrument [Line Items] |  |  |
Due after ten years | $ 500,000,000 |  | 500,000,000
Note stated interest rate (as a percent) | 5.10% |  |
5.750% Subordinated Debentures, due 2053 |  |  |
Debt Instrument [Line Items] |  |  |
Due after ten years | $ 800,000,000 |  | 800,000,000
Note stated interest rate (as a percent) | 5.75% |  |
6.500% Junior Subordinated Debentures, due 2067 |  |  |
Debt Instrument [Line Items] |  |  |
Due after ten years | $ 500,000,000 |  | $ 500,000,000
Total long-term debt | $ 500,000,000 |  |
Note stated interest rate (as a percent) | 6.50% |  |

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