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Benefit Plans - Fair Value of pension plan assets (Details) - Pension benefits - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Components of net periodic cost |  |  |  |
Total plan assets at fair value | $ 2,809 | $ 2,882 |  |
Total plan assets at fair value, allocation (as a percent) | 100.00% | 100.00% |  |
Investments measured using the net asset value practical expedient | $ 2,687 | $ 3,598 |  |
Securities lending obligation | (222) | (216) |  |
Derivatives Counterparty and Cash Collateral Netting | (6) |  |  |
Other net plan assets | 31 | 20 |  |
Fair value of plan assets | 5,299 | 6,284 | $ 5,650 |
Quoted prices in active markets for identical assets (Level 1) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | $ 345 | $ 418 |  |
Total plan assets at fair value, allocation (as a percent) | 12.30% | 14.50% |  |
Significant other observable inputs (Level 2) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | $ 2,459 | $ 2,425 |  |
Total plan assets at fair value, allocation (as a percent) | 87.50% | 84.10% |  |
Significant unobservable inputs (Level 3) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | $ 5 | $ 39 |  |
Total plan assets at fair value, allocation (as a percent) | 0.20% | 1.40% |  |
Fair value of plan assets | $ 5 | $ 39 | 10 | $ 18
Equity securities |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 316 | 419 |  |
Equity securities | Quoted prices in active markets for identical assets (Level 1) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 51 | 126 |  |
Equity securities | Significant other observable inputs (Level 2) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 265 | 264 |  |
Equity securities | Significant unobservable inputs (Level 3) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 0 | 29 |  |
Fair value of plan assets | 0 | 29 | 0 | 1
U.S. government and agencies |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 681 | 594 |  |
U.S. government and agencies | Quoted prices in active markets for identical assets (Level 1) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 172 | 174 |  |
U.S. government and agencies | Significant other observable inputs (Level 2) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 509 | 420 |  |
U.S. government and agencies | Significant unobservable inputs (Level 3) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 0 | 0 |  |
Corporate |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 1,484 | 1,553 |  |
Corporate | Quoted prices in active markets for identical assets (Level 1) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 0 | 0 |  |
Corporate | Significant other observable inputs (Level 2) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 1,479 | 1,543 |  |
Corporate | Significant unobservable inputs (Level 3) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 5 | 10 |  |
Fair value of plan assets | 5 | 10 | $ 10 | $ 10
Short-term investments |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 320 | 294 |  |
Short-term investments | Quoted prices in active markets for identical assets (Level 1) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 122 | 97 |  |
Short-term investments | Significant other observable inputs (Level 2) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 198 | 197 |  |
Short-term investments | Significant unobservable inputs (Level 3) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 0 | 0 |  |
Cash and cash equivalents |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value |  | 21 |  |
Cash and cash equivalents | Quoted prices in active markets for identical assets (Level 1) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value |  | 21 |  |
Cash and cash equivalents | Significant other observable inputs (Level 2) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value |  | 0 |  |
Cash and cash equivalents | Significant unobservable inputs (Level 3) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value |  | 0 |  |
Free Standing Derivative Assets |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 19 | 1 |  |
Free Standing Derivative Assets | Quoted prices in active markets for identical assets (Level 1) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 0 | 0 |  |
Free Standing Derivative Assets | Significant other observable inputs (Level 2) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 19 | 1 |  |
Free Standing Derivative Assets | Significant unobservable inputs (Level 3) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 0 | $ 0 |  |
Free Standing Derivative Liabilities |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | (11) |  |  |
Free Standing Derivative Liabilities | Quoted prices in active markets for identical assets (Level 1) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 0 |  |  |
Free Standing Derivative Liabilities | Significant other observable inputs (Level 2) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | (11) |  |  |
Free Standing Derivative Liabilities | Significant unobservable inputs (Level 3) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | $ 0 |  |  |

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