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Employee Benefit Plans - Narrative (Details) | 12 Months Ended |
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Dec. 31, 2021 USD ($) plan | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Defined contribution plan, employer matching contribution per dollar | $ 1.00 |  |
Defined contribution plan, employer matching contribution | 5.00% |  |
Defined contribution plan, employers matching contribution for vesting plan | 4.00% |  |
Defined contribution plan, employers matching contribution for vesting, period | 3 years |  |
Defined contribution plans, cost | $ 194,000,000 | $ 236,000,000 |
Number of non-qualified defined contribution plans | plan | 2 |  |
Defined contribution plan, assets and liabilities | $ 322,000,000 | 314,000,000 |
Pension plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension assets or obligations, threshold, per plan | 20,000,000 |  |
Accumulated postretirement benefit obligation | 3,550,000,000 | 3,806,000,000 | $ 3,451,000,000
Fair values of the plan assets | 3,147,000,000 | 3,202,000,000 | $ 3,004,000,000
Employer contributions | 28,000,000 | 20,000,000 |
Pension plan | Minimum |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Estimated future employer contributions in next fiscal year | 30,000,000 |  |
Pension plan | Maximum |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Estimated future employer contributions in next fiscal year | 35,000,000 |  |
Pension plan | Fixed income and cash investment funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair values of the plan assets | 1,890,000,000 | 1,807,000,000 |
Pension plan | Fair value measured at Net Asset Value per share |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair values of the plan assets | $ 3,028,000,000 | $ 3,072,000,000 |
Pension plan | Fair value measured at Net Asset Value per share | Equity securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Percent of plan assets valued using NAV | 16.00% | 21.00% |
Pension plan | Fair value measured at Net Asset Value per share | Fixed income and cash investment funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Percent of plan assets valued using NAV | 62.00% | 59.00% |
Pension plan | Fair value measured at Net Asset Value per share | Alternative investments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Percent of plan assets valued using NAV | 22.00% | 20.00% |
Pension plan | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair values of the plan assets | $ 119,000,000 | $ 130,000,000 |
Pension plan | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair values of the plan assets | $ 112,000,000 | 120,000,000 |
Pension plan | U.S. |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Number of retirement plans | plan | 4 |  |
Pension plan | Foreign |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Number of retirement plans | plan | 7 |  |
Postretirement Health Care Benefits | U.S. |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Accumulated postretirement benefit obligation | $ 50,000,000 | 62,000,000 |
Supplemental Pension Plan | U.S. | Nonqualified Plan | BH SPP |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Trust assets | $ 45,000,000 | $ 44,000,000 |

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