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Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
AOCI beginning balance | $ 3,494 |  |
Other comprehensive income (loss), net of tax | (3,120) | $ 2,346 | $ 1,531
AOCI ending balance | 374 | 3,494 |
Effects from transfer of securities held to maturity to available for sale |  |  | 888
Accounting Standards Update 2017-12 |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Amounts reclassified from AOCI into earnings |  |  | 360
Securities available for sale | Available-for-sale securities |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
AOCI beginning balance | 2,186 | 935 | (439)
Other comprehensive income (loss) before reclassifications | (1,887) | 1,278 | 670
Amounts reclassified from AOCI into earnings | (2) | (19) |
Other comprehensive income (loss), net of tax | (1,889) | 1,259 | 650
AOCI ending balance | 297 | 2,186 | 935
Effects from transfer of securities held to maturity to available for sale |  |  | 724
Securities available for sale | Securities Held to Maturity |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
AOCI beginning balance | 0 | 0 | (190)
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0
Amounts reclassified from AOCI into earnings | 0 | 0 | 26
Other comprehensive income (loss), net of tax | 0 | 0 | 26
AOCI ending balance | 0 | 0 | 0
Effects from transfer of securities held to maturity to available for sale |  |  | 164
Securities available for sale | Accounting Standards Update 2017-12 | Available-for-sale securities |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Amounts reclassified from AOCI into earnings |  |  | (20)
Hedging Relationships |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
AOCI beginning balance | 1,362 | 354 | (418)
Other comprehensive income (loss) before reclassifications | (396) | 1,401 | 414
Amounts reclassified from AOCI into earnings | (848) | (393) |
Other comprehensive income (loss), net of tax | (1,244) | 1,008 | 772
AOCI ending balance | 118 | 1,362 | 354
Effects from transfer of securities held to maturity to available for sale |  |  | 0
Hedging Relationships | Accounting Standards Update 2017-12 |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Amounts reclassified from AOCI into earnings |  |  | 358
Foreign Currency Translation Adjustments |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
AOCI beginning balance | (31) | (107) | (177)
Other comprehensive income (loss) before reclassifications | 10 | 76 | 70
Amounts reclassified from AOCI into earnings | 0 | 0 |
Other comprehensive income (loss), net of tax | 10 | 76 | 70
AOCI ending balance | (21) | (31) | (107)
Effects from transfer of securities held to maturity to available for sale |  |  | 0
Foreign Currency Translation Adjustments | Accounting Standards Update 2017-12 |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Amounts reclassified from AOCI into earnings |  |  | 0
Other |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
AOCI beginning balance | (23) | (26) | (39)
Other comprehensive income (loss) before reclassifications | 7 | 5 | 17
Amounts reclassified from AOCI into earnings | (4) | (2) |
Other comprehensive income (loss), net of tax | 3 | 3 | 13
AOCI ending balance | (20) | (23) | (26)
Effects from transfer of securities held to maturity to available for sale |  |  | 0
Other | Accounting Standards Update 2017-12 |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Amounts reclassified from AOCI into earnings |  |  | (4)
Total |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
AOCI beginning balance | 3,494 | 1,156 | (1,263)
Other comprehensive income (loss) before reclassifications | (2,266) | 2,760 | 1,171
Amounts reclassified from AOCI into earnings | (854) | (414) |
Other comprehensive income (loss), net of tax | (3,120) | 2,346 | 1,531
AOCI ending balance | 374 | 3,494 | 1,156
Effects from transfer of securities held to maturity to available for sale |  |  | 888
Net investment hedges |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Other comprehensive gain (loss) | $ 22 | (65) | $ (49)
Other comprehensive income before reclassifications | Securities available for sale | Available-for-sale securities |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Other comprehensive income (loss) before reclassifications |  | (8) |
Other comprehensive income before reclassifications | Hedging Relationships |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Other comprehensive income (loss) before reclassifications |  | 0 |
Other comprehensive income before reclassifications | Foreign Currency Translation Adjustments |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Other comprehensive income (loss) before reclassifications |  | 0 |
Other comprehensive income before reclassifications | Other |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Other comprehensive income (loss) before reclassifications |  | 0 |
Other comprehensive income before reclassifications | Total |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Other comprehensive income (loss) before reclassifications |  | $ (8) |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -URI http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e681-108580 + Details
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