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Employee Benefits - Amounts Recognized in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
AOCI Attributable To Parent, Tax [Roll Forward] |  |  |
Net Change in AOCL | $ (297) | $ (222) | $ (17)
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | 11,840 | 11,162 |
Recognition of Net Periodic Benefits Expense | 622 | 500 |
Deferrals | 437 | 155 |
Net Change in AOCL | 1,059 | 655 | (133)
Balance at end of period | 10,437 | 11,840 | 11,162
Reclassification of net actuarial loss and prior service credit to gain on the sale of business |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (1,741) | (2,469) |
Recognition of Net Periodic Benefits Expense | 493 | 437 |
Deferrals | 571 | 291 |
Net Change in AOCL | 1,064 | 728 |
Balance at end of period | (677) | (1,741) | (2,469)
Combined Pension Plan | Reclassification of net actuarial loss and prior service credit to gain on the sale of business |  |  |
AOCI Attributable To Parent, Tax [Roll Forward] |  |  |
Balance at beginning of period | 559 | 755 |
Recognition of Net Periodic Benefits Expense | (166) | (137) |
Deferrals | (26) | (59) |
Net Change in AOCL | (192) | (196) |
Balance at end of period | 367 | 559 | 755
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (1,577) | (2,197) |
Recognition of Net Periodic Benefits Expense | 494 | 423 |
Deferrals | 98 | 197 |
Net Change in AOCL | 592 | 620 |
Balance at end of period | (985) | (1,577) | (2,197)
Combined Pension Plan | Net actuarial (loss) gain |  |  |
AOCI Attributable To Parent, Before Tax [Roll Forward] |  |  |
Balance at beginning of period | (2,564) | (2,993) |
Recognition of Net Periodic Benefits Expense | 688 | 186 |
Deferrals | 124 | 243 |
Net Change in AOCL | 812 | 429 |
Balance at end of period | (1,752) | (2,564) | (2,993)
Combined Pension Plan | Settlement charge |  |  |
AOCI Attributable To Parent, Before Tax [Roll Forward] |  |  |
Balance at beginning of period | 383 | 0 |
Recognition of Net Periodic Benefits Expense | 0 | 383 |
Deferrals | 0 | 0 |
Net Change in AOCL | 0 | 383 |
Balance at end of period | 383 | 383 | 0
Combined Pension Plan | Prior service benefit (cost) |  |  |
AOCI Attributable To Parent, Before Tax [Roll Forward] |  |  |
Balance at beginning of period | 45 | 41 |
Recognition of Net Periodic Benefits Expense | (28) | (9) |
Deferrals | 0 | 13 |
Net Change in AOCL | (28) | 4 |
Balance at end of period | 17 | 45 | 41
Post-Retirement Benefit Plans | Reclassification of net actuarial loss and prior service credit to gain on the sale of business |  |  |
AOCI Attributable To Parent, Tax [Roll Forward] |  |  |
Balance at beginning of period | 54 | 90 |
Recognition of Net Periodic Benefits Expense | 1 | (5) |
Deferrals | (159) | (31) |
Net Change in AOCL | (158) | (36) |
Balance at end of period | (104) | 54 | 90
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (164) | (272) |
Recognition of Net Periodic Benefits Expense | (1) | 14 |
Deferrals | 473 | 94 |
Net Change in AOCL | 472 | 108 |
Balance at end of period | 308 | (164) | (272)
Post-Retirement Benefit Plans | Net actuarial (loss) gain |  |  |
AOCI Attributable To Parent, Before Tax [Roll Forward] |  |  |
Balance at beginning of period | (217) | (346) |
Recognition of Net Periodic Benefits Expense | (3) | 4 |
Deferrals | 591 | 125 |
Net Change in AOCL | 588 | 129 |
Balance at end of period | 371 | (217) | (346)
Post-Retirement Benefit Plans | Prior service benefit (cost) |  |  |
AOCI Attributable To Parent, Before Tax [Roll Forward] |  |  |
Balance at beginning of period | (5) | (20) |
Recognition of Net Periodic Benefits Expense | 1 | 15 |
Deferrals | 41 | 0 |
Net Change in AOCL | 42 | 15 |
Balance at end of period | 37 | (5) | (20)
Post-Retirement Benefit Plans | Curtailment loss |  |  |
AOCI Attributable To Parent, Before Tax [Roll Forward] |  |  |
Balance at beginning of period | (4) | (4) |
Recognition of Net Periodic Benefits Expense | 0 | 0 |
Deferrals | 0 | 0 |
Net Change in AOCL | 0 | 0 |
Balance at end of period | $ (4) | $ (4) | $ (4)

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