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Capital Structure - Total debt outstanding (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 08, 2016
Debt Instrument [Line Items] |  |  |
Due after one year through five years | $ 493 | $ 493 |
Due after five years through ten years | 1,050 | 1,050 |
Due after ten years | 4,865 | 4,865 |
Total long-term debt principal | 6,408 | 6,408 |
Debt issuance costs | (58) | (61) |
Total long-term debt | 6,350 | 6,347 |
Short-term debt | 0 | 0 |
Total debt | $ 6,350 | 6,347 |
Redemption price as percentage of principal amount plus accrued and unpaid interest | 100.00% |  |
6.75% Senior Debentures, due 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Due after one year through five years | $ 176 | 176 |
Note stated interest rate (as a percent) | 6.75% |  |
7.45% Senior Notes, due 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Due after one year through five years | $ 317 | 317 |
Note stated interest rate (as a percent) | 7.45% |  |
3.15% Senior Notes, due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Due after five years through ten years | $ 500 | 500 |
Note stated interest rate (as a percent) | 3.15% |  |
3.28% Senior Notes, due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Due after five years through ten years | $ 550 | 550 |
Note stated interest rate (as a percent) | 3.28% |  | 3.28%
6.125% Senior Notes, due 2032 |  |  |
Debt Instrument [Line Items] |  |  |
Due after ten years | $ 159 | 159 |
Note stated interest rate (as a percent) | 6.125% |  |
5.35% Senior Notes due 2033 |  |  |
Debt Instrument [Line Items] |  |  |
Due after ten years | $ 323 | 323 |
Note stated interest rate (as a percent) | 5.35% |  |
5.55% Senior Notes due 2035 |  |  |
Debt Instrument [Line Items] |  |  |
Due after ten years | $ 546 | 546 |
Note stated interest rate (as a percent) | 5.55% |  |
5.95% Senior Notes, due 2036 |  |  |
Debt Instrument [Line Items] |  |  |
Due after ten years | $ 386 | 386 |
Note stated interest rate (as a percent) | 5.95% |  |
6.90% Senior Debentures, due 2038 |  |  |
Debt Instrument [Line Items] |  |  |
Due after ten years | $ 165 | 165 |
Note stated interest rate (as a percent) | 6.90% |  |
5.20% Senior Notes due 2042 |  |  |
Debt Instrument [Line Items] |  |  |
Due after ten years | $ 62 | 62 |
Note stated interest rate (as a percent) | 5.20% |  |
4.50% Senior Notes, due 2043 |  |  |
Debt Instrument [Line Items] |  |  |
Due after ten years | $ 500 | 500 |
Note stated interest rate (as a percent) | 4.50% |  |
4.20% Senior Notes, due 2046 |  |  |
Debt Instrument [Line Items] |  |  |
Due after ten years | $ 700 | 700 |
Note stated interest rate (as a percent) | 4.20% |  | 4.20%
5.10% Subordinated Debentures, due 2053 |  |  |
Debt Instrument [Line Items] |  |  |
Due after ten years | $ 500 | 500 |
Note stated interest rate (as a percent) | 5.10% |  |
5.75% Subordinated Debentures, due 2053 |  |  |
Debt Instrument [Line Items] |  |  |
Due after ten years | $ 800 | 800 |
Note stated interest rate (as a percent) | 5.75% |  |
6.125% Junior Subordinated Debentures, due 2067 |  |  |
Debt Instrument [Line Items] |  |  |
Due after ten years | $ 224 | 224 |
Total long-term debt | $ 224 |  |
Note stated interest rate (as a percent) | 6.125% |  |
6.50% Junior Subordinated Debentures, due 2067 |  |  |
Debt Instrument [Line Items] |  |  |
Due after ten years | $ 500 | $ 500 |
Total long-term debt | $ 500 |  |
Note stated interest rate (as a percent) | 6.50% |  |

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