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Shareholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance | $ 1,291 | $ 4,361 | $ 1,158 | $ 3,583
Other comprehensive income (loss) before reclassifications, net |  |  | (431) | 62
Amounts reclassified from accumulated other comprehensive income |  |  |  |
Amounts reclassified from accumulated other comprehensive income |  |  | 57 | 72
Tax expense |  |  | (15) | (17)
Amounts reclassified from accumulated other comprehensive income, net |  |  | 42 | 55
Net current period other comprehensive income (loss) | (417) | 147 | (389) | 117
Ending Balance | 788 | 4,567 | 788 | 4,567
Change in Fair Value of Financial Instruments |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  |  | 2 | 1
Other comprehensive income (loss) before reclassifications, net |  |  | (5) | 9
Amounts reclassified from accumulated other comprehensive income |  |  |  |
Amounts reclassified from accumulated other comprehensive income |  |  | (4) | 1
Tax expense |  |  | 1 | 0
Amounts reclassified from accumulated other comprehensive income, net |  |  | (3) | 1
Net current period other comprehensive income (loss) |  |  | (8) | 10
Ending Balance | (6) | 11 | (6) | 11
Foreign Currency Translation Adjustments |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  |  | (1,333) | (1,045)
Other comprehensive income (loss) before reclassifications, net |  |  | (442) | 45
Amounts reclassified from accumulated other comprehensive income |  |  |  |
Amounts reclassified from accumulated other comprehensive income |  |  | 0 | 0
Tax expense |  |  | 0 | 0
Amounts reclassified from accumulated other comprehensive income, net |  |  | 0 | 0
Net current period other comprehensive income (loss) |  |  | (442) | 45
Ending Balance | (1,775) | (1,000) | (1,775) | (1,000)
Postretirement Benefit Obligation |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  |  | (2,540) | (2,817)
Other comprehensive income (loss) before reclassifications, net |  |  | 16 | 8
Amounts reclassified from accumulated other comprehensive income |  |  |  |
Amounts reclassified from accumulated other comprehensive income |  |  | 61 | 71
Tax expense |  |  | (16) | (17)
Amounts reclassified from accumulated other comprehensive income, net |  |  | 45 | 54
Net current period other comprehensive income (loss) |  |  | 61 | 62
Ending Balance | (2,479) | (2,755) | (2,479) | (2,755)
AOCI Attributable to Parent |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance | (3,843) | (3,891) | (3,871) | (3,861)
Amounts reclassified from accumulated other comprehensive income |  |  |  |
Ending Balance | $ (4,260) | $ (3,744) | $ (4,260) | $ (3,744)

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