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Benefit Plans - Fair Value of pension plan assets (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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 |  |
Pension benefits |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | $ 3,020 | $ 2,809 |  |
Total plan assets at fair value, allocation (as a percent) | 100.00% | 100.00% |  |
Investments measured using the net asset value practical expedient | $ 3,418 | $ 2,687 |  |
Securities lending obligation | (272) | (222) |  |
Derivatives counterparty and cash collateral netting | 9 | (6) |  |
Other net plan assets | 17 | 31 |  |
Fair value of plan assets | 6,192 | 5,299 | $ 6,284 |
Pension benefits | Quoted prices in active markets for identical assets (Level 1) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | $ 579 | $ 345 |  |
Total plan assets at fair value, allocation (as a percent) | 19.20% | 12.30% |  |
Pension benefits | Significant other observable inputs (Level 2) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | $ 2,441 | $ 2,459 |  |
Total plan assets at fair value, allocation (as a percent) | 80.80% | 87.50% |  |
Pension benefits | Significant unobservable inputs (Level 3) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | $ 0 | $ 5 |  |
Total plan assets at fair value, allocation (as a percent) | 0.00% | 0.20% |  |
Fair value of plan assets | $ 0 | $ 5 | 39 | $ 10
Pension benefits | Equity securities |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 261 | 316 |  |
Pension benefits | Equity securities | Quoted prices in active markets for identical assets (Level 1) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 216 | 51 |  |
Pension benefits | Equity securities | Significant other observable inputs (Level 2) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 45 | 265 |  |
Pension benefits | Equity securities | Significant unobservable inputs (Level 3) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 0 | 0 |  |
Fair value of plan assets | 0 | 0 | 29 | 0
Pension benefits | U.S. government and agencies |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 1,333 | 681 |  |
Pension benefits | 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 | 237 | 172 |  |
Pension benefits | U.S. government and agencies | Significant other observable inputs (Level 2) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 1,096 | 509 |  |
Pension benefits | U.S. government and agencies | Significant unobservable inputs (Level 3) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 0 | 0 |  |
Pension benefits | Corporate |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 1,060 | 1,484 |  |
Pension benefits | Corporate | Quoted prices in active markets for identical assets (Level 1) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 0 | 0 |  |
Pension benefits | Corporate | Significant other observable inputs (Level 2) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 1,060 | 1,479 |  |
Pension benefits | Corporate | Significant unobservable inputs (Level 3) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 0 | 5 |  |
Fair value of plan assets | 0 | 5 | $ 10 | $ 10
Pension benefits | Short-term investments |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 380 | 320 |  |
Pension benefits | Short-term investments | Quoted prices in active markets for identical assets (Level 1) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 128 | 122 |  |
Pension benefits | Short-term investments | Significant other observable inputs (Level 2) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 252 | 198 |  |
Pension benefits | Short-term investments | Significant unobservable inputs (Level 3) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 0 | 0 |  |
Pension benefits | Free Standing Derivative Assets |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 5 | 19 |  |
Pension benefits | 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 |  |
Pension benefits | Free Standing Derivative Assets | Significant other observable inputs (Level 2) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 5 | 19 |  |
Pension benefits | Free Standing Derivative Assets | Significant unobservable inputs (Level 3) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | 0 | 0 |  |
Pension benefits | Free Standing Derivative Liabilities |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | (19) | $ (11) |  |
Pension benefits | 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 | (2) |  |  |
Pension benefits | Free Standing Derivative Liabilities | Significant other observable inputs (Level 2) |  |  |  |
Components of net periodic cost |  |  |  |
Total plan assets at fair value | (17) |  |  |
Pension benefits | 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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- Definition The fair value of plan assets before net receivables and reductions for liabilities other than for benefits. + References No definition available. + Details
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- Definition Represents the plan's obligation to return securities lending collateral received under a securities lending program. Due to its relatively short-term nature, the outstanding balance of the obligation approximates fair value. + References No definition available. + Details
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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 54B -URI http://asc.fasb.org/extlink&oid=117332851&loc=SL7495116-110257 + Details
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