v3.8.0.1

Employee Benefit Plans (Pension and Post Retirement Asset Allocations in Accordance with Investment Guidelines) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Notional | $ 392,399 | $ 366,091 |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 13,655 | 12,861 | $ 12,541
Net Value of investment of securities lending collateral invested in short-term bond | 411 | 627 |
Liability for securities lending collateral | 411 | 627 |
Pension Benefits | Equities | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 631 | 538 |
Pension Benefits | Equities | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 736 | 537 |
Pension Benefits | Equities | Pooled separate accounts | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 552 | 472 |
Pension Benefits | Equities | Pooled separate accounts | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 365 | 269 |
Pension Benefits | Equities | Common/collective trusts | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 79 | 66 |
Pension Benefits | Equities | Common/collective trusts | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 315 | 219 |
Pension Benefits | Equities | United Kingdom insurance pooled funds | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 56 | 49 |
Pension Benefits | Fixed Maturities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 8,955 | 8,747 |
Pension Benefits | Fixed Maturities | Pooled separate accounts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,357 | 1,283 |
Pension Benefits | Fixed Maturities | Common/collective trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 509 | 441 |
Pension Benefits | Fixed Maturities | Mortgage-backed |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1 | 1 |
Pension Benefits | Fixed Maturities | Other U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,402 | 993 |
Pension Benefits | Fixed Maturities | U.S. government securities (state & other) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 556 | 521 |
Pension Benefits | Fixed Maturities | Non-U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 10 | 14 |
Pension Benefits | Fixed Maturities | United Kingdom insurance pooled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 324 | 305 |
Pension Benefits | Fixed Maturities | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 3,622 | 4,039 |
Pension Benefits | Fixed Maturities | Asset-backed |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 5 | 7 |
Pension Benefits | Fixed Maturities | Collateralized Mortgage Obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 492 | 506 |
Pension Benefits | Fixed Maturities | Interest Rate Swaps |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 12 | 9 |
Pension Benefits | Fixed Maturities | Variable Life Insurance Policies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 47 | 39 |
Pension Benefits | Fixed Maturities | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 618 | 589 |
Pension Benefits | Fixed Maturities | Unrealized gain (loss) on investment of securities lending collateral |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Short-term Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 57 | 56 |
Pension Benefits | Short-term Investments | Pooled separate accounts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 56 | 55 |
Pension Benefits | Short-term Investments | United Kingdom insurance pooled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1 | 1 |
Pension Benefits | Real Estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,149 | 1,037 |
Pension Benefits | Real Estate | Pooled separate accounts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 714 | 666 |
Pension Benefits | Real Estate | Partnerships |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 435 | 371 |
Pension Benefits | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 2,127 | 1,946 |
Pension Benefits | Other | Partnerships |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 706 | 551 |
Pension Benefits | Other | Hedge Fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,421 | 1,395 |
Pension Benefits | NAV Practical Expedient |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 2,562 | 2,317 |
Pension Benefits | NAV Practical Expedient | Equities | Pooled separate accounts | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | NAV Practical Expedient | Equities | Pooled separate accounts | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | NAV Practical Expedient | Equities | Common/collective trusts | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | NAV Practical Expedient | Equities | Common/collective trusts | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | NAV Practical Expedient | Equities | United Kingdom insurance pooled funds | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | NAV Practical Expedient | Fixed Maturities | Pooled separate accounts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | NAV Practical Expedient | Fixed Maturities | Common/collective trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | NAV Practical Expedient | Fixed Maturities | Mortgage-backed |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | NAV Practical Expedient | Fixed Maturities | Other U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | NAV Practical Expedient | Fixed Maturities | U.S. government securities (state & other) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | NAV Practical Expedient | Fixed Maturities | Non-U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | NAV Practical Expedient | Fixed Maturities | United Kingdom insurance pooled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | NAV Practical Expedient | Fixed Maturities | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | NAV Practical Expedient | Fixed Maturities | Asset-backed |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | NAV Practical Expedient | Fixed Maturities | Collateralized Mortgage Obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | NAV Practical Expedient | Fixed Maturities | Interest Rate Swaps |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | NAV Practical Expedient | Fixed Maturities | Variable Life Insurance Policies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | NAV Practical Expedient | Fixed Maturities | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | NAV Practical Expedient | Fixed Maturities | Unrealized gain (loss) on investment of securities lending collateral |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | NAV Practical Expedient | Short-term Investments | Pooled separate accounts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | NAV Practical Expedient | Short-term Investments | United Kingdom insurance pooled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | NAV Practical Expedient | Real Estate | Pooled separate accounts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | NAV Practical Expedient | Real Estate | Partnerships |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 435 | 371 |
Pension Benefits | NAV Practical Expedient | Other | Partnerships |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 706 | 551 |
Pension Benefits | NAV Practical Expedient | Other | Hedge Fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,421 | 1,395 |
Pension Benefits | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 578 | 533 |
Pension Benefits | Level 1 | Equities | Pooled separate accounts | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 1 | Equities | Pooled separate accounts | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 1 | Equities | Common/collective trusts | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 1 | Equities | Common/collective trusts | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 1 | Equities | United Kingdom insurance pooled funds | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 1 | Fixed Maturities | Pooled separate accounts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 1 | Fixed Maturities | Common/collective trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 1 | Fixed Maturities | Mortgage-backed |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 1 | Fixed Maturities | Other U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 1 | Fixed Maturities | U.S. government securities (state & other) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 1 | Fixed Maturities | Non-U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 1 | Fixed Maturities | United Kingdom insurance pooled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 1 | Fixed Maturities | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 1 | Fixed Maturities | Asset-backed |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 1 | Fixed Maturities | Collateralized Mortgage Obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 1 | Fixed Maturities | Interest Rate Swaps |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 1 | Fixed Maturities | Variable Life Insurance Policies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 1 | Fixed Maturities | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 578 | 533 |
Pension Benefits | Level 1 | Fixed Maturities | Unrealized gain (loss) on investment of securities lending collateral |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 1 | Short-term Investments | Pooled separate accounts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 1 | Short-term Investments | United Kingdom insurance pooled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 1 | Real Estate | Pooled separate accounts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 1 | Real Estate | Partnerships |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 1 | Other | Partnerships |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 1 | Other | Hedge Fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 9,723 | 9,260 |
Pension Benefits | Level 2 | Equities | Pooled separate accounts | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 552 | 472 |
Pension Benefits | Level 2 | Equities | Pooled separate accounts | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 365 | 269 |
Pension Benefits | Level 2 | Equities | Common/collective trusts | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 79 | 66 |
Pension Benefits | Level 2 | Equities | Common/collective trusts | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 315 | 219 |
Pension Benefits | Level 2 | Equities | United Kingdom insurance pooled funds | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 56 | 49 |
Pension Benefits | Level 2 | Fixed Maturities | Pooled separate accounts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,319 | 1,247 |
Pension Benefits | Level 2 | Fixed Maturities | Common/collective trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 509 | 441 |
Pension Benefits | Level 2 | Fixed Maturities | Mortgage-backed |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1 | 1 |
Pension Benefits | Level 2 | Fixed Maturities | Other U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,402 | 993 |
Pension Benefits | Level 2 | Fixed Maturities | U.S. government securities (state & other) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 556 | 521 |
Pension Benefits | Level 2 | Fixed Maturities | Non-U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 10 | 14 |
Pension Benefits | Level 2 | Fixed Maturities | United Kingdom insurance pooled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 324 | 305 |
Pension Benefits | Level 2 | Fixed Maturities | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 3,621 | 4,039 |
Pension Benefits | Level 2 | Fixed Maturities | Asset-backed |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 5 | 7 |
Pension Benefits | Level 2 | Fixed Maturities | Collateralized Mortgage Obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 492 | 506 |
Pension Benefits | Level 2 | Fixed Maturities | Interest Rate Swaps |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 12 | 9 |
Pension Benefits | Level 2 | Fixed Maturities | Variable Life Insurance Policies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 47 | 39 |
Pension Benefits | Level 2 | Fixed Maturities | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1 | 7 |
Pension Benefits | Level 2 | Fixed Maturities | Unrealized gain (loss) on investment of securities lending collateral |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 2 | Short-term Investments | Pooled separate accounts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 56 | 55 |
Pension Benefits | Level 2 | Short-term Investments | United Kingdom insurance pooled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1 | 1 |
Pension Benefits | Level 2 | Real Estate | Pooled separate accounts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 2 | Real Estate | Partnerships |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 2 | Other | Partnerships |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 2 | Other | Hedge Fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 792 | 751 |
Pension Benefits | Level 3 | Equities | Pooled separate accounts | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 3 | Equities | Pooled separate accounts | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 3 | Equities | Common/collective trusts | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 3 | Equities | Common/collective trusts | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 3 | Equities | United Kingdom insurance pooled funds | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 3 | Fixed Maturities | Pooled separate accounts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 38 | 36 |
Pension Benefits | Level 3 | Fixed Maturities | Common/collective trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 3 | Fixed Maturities | Mortgage-backed |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 3 | Fixed Maturities | Other U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 3 | Fixed Maturities | U.S. government securities (state & other) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 3 | Fixed Maturities | Non-U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 3 | Fixed Maturities | United Kingdom insurance pooled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 3 | Fixed Maturities | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1 | 0 |
Pension Benefits | Level 3 | Fixed Maturities | Asset-backed |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 3 | Fixed Maturities | Collateralized Mortgage Obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 3 | Fixed Maturities | Interest Rate Swaps |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 3 | Fixed Maturities | Variable Life Insurance Policies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 3 | Fixed Maturities | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 39 | 49 |
Pension Benefits | Level 3 | Fixed Maturities | Unrealized gain (loss) on investment of securities lending collateral |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 3 | Short-term Investments | Pooled separate accounts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 3 | Short-term Investments | United Kingdom insurance pooled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 3 | Real Estate | Pooled separate accounts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 714 | 666 |
Pension Benefits | Level 3 | Real Estate | Partnerships |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 3 | Other | Partnerships |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Pension Benefits | Level 3 | Other | Hedge Fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,615 | 1,531 | $ 1,584
Other Postretirement Benefits | Equities | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 789 | 676 |
Other Postretirement Benefits | Equities | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 216 | 186 |
Other Postretirement Benefits | Equities | Common/collective trusts | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 182 | 170 |
Other Postretirement Benefits | Equities | Common/collective trusts | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 110 | 96 |
Other Postretirement Benefits | Equities | Equities | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 2 |  |
Other Postretirement Benefits | Equities | Variable Life Insurance Policies | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 605 | 506 |
Other Postretirement Benefits | Equities | Variable Life Insurance Policies | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 106 | 90 |
Other Postretirement Benefits | Fixed Maturities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 553 | 555 |
Other Postretirement Benefits | Fixed Maturities | Common/collective trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 52 | 59 |
Other Postretirement Benefits | Fixed Maturities | Other U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 87 | 78 |
Other Postretirement Benefits | Fixed Maturities | Non-U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 2 | 2 |
Other Postretirement Benefits | Fixed Maturities | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 151 | 176 |
Other Postretirement Benefits | Fixed Maturities | Asset-backed |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 28 | 49 |
Other Postretirement Benefits | Fixed Maturities | Collateralized Mortgage Obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 29 | 27 |
Other Postretirement Benefits | Fixed Maturities | Other collateralized loans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 30 |  |
Other Postretirement Benefits | Fixed Maturities | Interest Rate Swaps |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 1 |
Other Postretirement Benefits | Fixed Maturities | Variable Life Insurance Policies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 163 | 157 |
Other Postretirement Benefits | Fixed Maturities | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 11 | 6 |
Other Postretirement Benefits | Short-term Investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 57 | 114 |
Other Postretirement Benefits | Short-term Investments | Registered investment companies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 57 | 114 |
Other Postretirement Benefits | NAV Practical Expedient |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | NAV Practical Expedient | Equities | Common/collective trusts | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | NAV Practical Expedient | Equities | Common/collective trusts | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | NAV Practical Expedient | Equities | Equities | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 |  |
Other Postretirement Benefits | NAV Practical Expedient | Equities | Variable Life Insurance Policies | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | NAV Practical Expedient | Equities | Variable Life Insurance Policies | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | NAV Practical Expedient | Fixed Maturities | Common/collective trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | NAV Practical Expedient | Fixed Maturities | Other U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | NAV Practical Expedient | Fixed Maturities | Non-U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | NAV Practical Expedient | Fixed Maturities | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | NAV Practical Expedient | Fixed Maturities | Asset-backed |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | NAV Practical Expedient | Fixed Maturities | Collateralized Mortgage Obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | NAV Practical Expedient | Fixed Maturities | Other collateralized loans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 |  |
Other Postretirement Benefits | NAV Practical Expedient | Fixed Maturities | Interest Rate Swaps |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 0 |
Other Postretirement Benefits | NAV Practical Expedient | Fixed Maturities | Variable Life Insurance Policies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | NAV Practical Expedient | Fixed Maturities | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | NAV Practical Expedient | Short-term Investments | Registered investment companies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 63 | 115 |
Other Postretirement Benefits | Level 1 | Equities | Common/collective trusts | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | Level 1 | Equities | Common/collective trusts | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | Level 1 | Equities | Equities | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 |  |
Other Postretirement Benefits | Level 1 | Equities | Variable Life Insurance Policies | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | Level 1 | Equities | Variable Life Insurance Policies | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | Level 1 | Fixed Maturities | Common/collective trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | Level 1 | Fixed Maturities | Other U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | Level 1 | Fixed Maturities | Non-U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | Level 1 | Fixed Maturities | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | Level 1 | Fixed Maturities | Asset-backed |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | Level 1 | Fixed Maturities | Collateralized Mortgage Obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | Level 1 | Fixed Maturities | Other collateralized loans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 |  |
Other Postretirement Benefits | Level 1 | Fixed Maturities | Interest Rate Swaps |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 0 |
Other Postretirement Benefits | Level 1 | Fixed Maturities | Variable Life Insurance Policies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | Level 1 | Fixed Maturities | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 6 | 1 |
Other Postretirement Benefits | Level 1 | Short-term Investments | Registered investment companies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 57 | 114 |
Other Postretirement Benefits | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,543 | 1,405 |
Other Postretirement Benefits | Level 2 | Equities | Common/collective trusts | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 182 | 170 |
Other Postretirement Benefits | Level 2 | Equities | Common/collective trusts | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 110 | 96 |
Other Postretirement Benefits | Level 2 | Equities | Equities | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 2 |  |
Other Postretirement Benefits | Level 2 | Equities | Variable Life Insurance Policies | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 605 | 506 |
Other Postretirement Benefits | Level 2 | Equities | Variable Life Insurance Policies | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 106 | 90 |
Other Postretirement Benefits | Level 2 | Fixed Maturities | Common/collective trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 52 | 59 |
Other Postretirement Benefits | Level 2 | Fixed Maturities | Other U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 87 | 78 |
Other Postretirement Benefits | Level 2 | Fixed Maturities | Non-U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 2 | 2 |
Other Postretirement Benefits | Level 2 | Fixed Maturities | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 151 | 176 |
Other Postretirement Benefits | Level 2 | Fixed Maturities | Asset-backed |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 28 | 48 |
Other Postretirement Benefits | Level 2 | Fixed Maturities | Collateralized Mortgage Obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 27 | 22 |
Other Postretirement Benefits | Level 2 | Fixed Maturities | Other collateralized loans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 28 |  |
Other Postretirement Benefits | Level 2 | Fixed Maturities | Interest Rate Swaps |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 1 |
Other Postretirement Benefits | Level 2 | Fixed Maturities | Variable Life Insurance Policies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 163 | 157 |
Other Postretirement Benefits | Level 2 | Fixed Maturities | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | Level 2 | Short-term Investments | Registered investment companies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 9 | 11 |
Other Postretirement Benefits | Level 3 | Equities | Common/collective trusts | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | Level 3 | Equities | Common/collective trusts | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | Level 3 | Equities | Equities | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 |  |
Other Postretirement Benefits | Level 3 | Equities | Variable Life Insurance Policies | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | Level 3 | Equities | Variable Life Insurance Policies | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | Level 3 | Fixed Maturities | Common/collective trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | Level 3 | Fixed Maturities | Other U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | Level 3 | Fixed Maturities | Non-U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | Level 3 | Fixed Maturities | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | Level 3 | Fixed Maturities | Asset-backed |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 1 |
Other Postretirement Benefits | Level 3 | Fixed Maturities | Collateralized Mortgage Obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 2 | 5 |
Other Postretirement Benefits | Level 3 | Fixed Maturities | Other collateralized loans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 2 |  |
Other Postretirement Benefits | Level 3 | Fixed Maturities | Interest Rate Swaps |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 0 |
Other Postretirement Benefits | Level 3 | Fixed Maturities | Variable Life Insurance Policies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Other Postretirement Benefits | Level 3 | Fixed Maturities | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 5 | 5 |
Other Postretirement Benefits | Level 3 | Short-term Investments | Registered investment companies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 0 | $ 0 |

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