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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 | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive loss | $ (9,204) | $ (9,676) | $ (9,204) | $ (9,676) |  | $ (8,977) |  |
Other Comprehensive Income (Loss), Net of Tax | (408) | 237 | (227) | 1,179 |  |  |  |
Derivative instruments | 137 | 6 | 469 | 116 |  |  |  |
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive loss | (190) | 72 | (190) | 72 | $ (37) | 59 | $ 55 | $ 104
Other Comprehensive Income (Loss), before Reclassifications, before Tax | (203) | 39 | (324) | (15) |  |  |  |
Other Comprehensive Income (Loss), Tax | 43 | (9) | 67 | 2 |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (160) | 30 | (257) | (13) |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | (153) | 17 | (249) | (32) |  |  |  |
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 9 | (17) | 10 | (25) |  |  |  |
Reclassification from AOCI, Current Period, Tax | (2) | 4 | (2) | 6 |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 7 | (13) | 8 | (19) |  |  |  |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive loss | (2,033) | (1,118) | (2,033) | (1,118) | (1,519) | (1,355) | (1,183) | (930)
Other Comprehensive Income (Loss), before Reclassifications, before Tax | (500) | 67 | (665) | (150) |  |  |  |
Other Comprehensive Income (Loss), Tax | (3) | 1 | 10 | (35) |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (503) | 68 | (655) | (185) |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | (514) | 65 | (678) | (188) |  |  |  |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (11) | (3) | (23) | (3) |  |  |  |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive loss | (7,103) | (8,276) | (7,103) | (8,276) | (7,225) | (7,334) | (8,425) | (9,559)
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 3 | 0 | 5 | 1,268 |  |  |  |
Other Comprehensive Income (Loss), Tax | 0 | 0 | 0 | (298) |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 3 | 0 | 5 | 970 |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | 122 | 149 | 231 | 1,283 |  |  |  |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 156 | 194 | 313 | 392 |  |  |  |
Reclassification from AOCI, Current Period, Tax | (37) | (45) | (87) | (79) |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 119 | 149 | 226 | 313 |  |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive loss | 122 | (354) | 122 | (354) | $ (15) | $ (347) | $ (360) | $ (470)
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 260 | (10) | 680 | 112 |  |  |  |
Other Comprehensive Income (Loss), Tax | (27) | 8 | (83) | (1) |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 233 | (2) | 597 | 111 |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | (108) | 9 | (142) | 6 |  |  |  |
Reclassification from AOCI, Current Period, Tax | 12 | (1) | 14 | (1) |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (96) | 8 | (128) | 5 |  |  |  |
Derivative instruments | $ 137 | $ 6 | $ 469 | $ 116 |  |  |  |

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