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Capital Structure - Total debt outstanding (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | May 15, 2018 | May 13, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |
Due after one year through five years | $ 1,317 |  |  | $ 993
Due after five years through ten years | 550 |  |  | 550
Due after ten years | 4,641 |  |  | 4,865
Total long-term debt principal | 6,508 |  |  | 6,408
Debt issuance costs | (57) |  |  | (58)
Total long-term debt | 6,451 |  |  | 6,350
Short-term debt | 0 |  |  | 0
Total debt | $ 6,451 |  |  | 6,350
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 | $ 0 |  |  | 176
Note stated interest rate (as a percent) | 6.75% | 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% |  |  |
Floating Rate Senior Notes, due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Due after one year through five years | $ 250 |  |  | 0
Floating Rate Senior Notes, due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Due after one year through five years | 250 |  |  | 0
3.15% Senior Notes, due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Due after one year through five 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% |  |  |
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% |  |  |
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 | $ 0 |  |  | 224
Note stated interest rate (as a percent) | 6.125% |  | 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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