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Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
AOCI beginning balance | $ 3,494 |
Other comprehensive income (loss), net of tax | (1,711) | $ 2,531
AOCI ending balance | 1,783 |
Accumulated Net Unrealized Investment Gain (Loss) | Securities Available for Sale |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
AOCI beginning balance | 2,186 | 935
Other comprehensive income (loss) before reclassifications | (1,145) | 1,224
Amounts reclassified from AOCI into earnings | (3) | 0
Other comprehensive income (loss), net of tax | (1,148) | 1,224
AOCI ending balance | 1,038 | 2,151
Hedging Relationships |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
AOCI beginning balance | 1,362 | 354
Other comprehensive income (loss) before reclassifications | (338) | 1,695
Amounts reclassified from AOCI into earnings | (243) | (321)
Other comprehensive income (loss), net of tax | (581) | 1,374
AOCI ending balance | 781 | 1,728
Foreign Currency Translation Adjustments |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
AOCI beginning balance | (31) | (107)
Other comprehensive income (loss) before reclassifications | 19 | (67)
Amounts reclassified from AOCI into earnings | 0 | 0
Other comprehensive income (loss), net of tax | 19 | (67)
AOCI ending balance | (12) | (174)
Other |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
AOCI beginning balance | (23) | (26)
Other comprehensive income (loss) before reclassifications | 0 | 0
Amounts reclassified from AOCI into earnings | (1) | 0
Other comprehensive income (loss), net of tax | (1) | 0
AOCI ending balance | (24) | (26)
Accumulated Other Comprehensive Income (Loss) |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
AOCI beginning balance | 3,494 | 1,156
Other comprehensive income (loss) before reclassifications | (1,464) | 2,852
Amounts reclassified from AOCI into earnings | (247) | (321)
Other comprehensive income (loss), net of tax | (1,711) | 2,531
AOCI ending balance | 1,783 | 3,679
Net investment hedges |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Other comprehensive gain (loss) | $ (21) | 142
Cumulative effects from adoption of new accounting standards | Accumulated Net Unrealized Investment Gain (Loss) | Securities Available for Sale |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
AOCI beginning balance |  | (8)
Cumulative effects from adoption of new accounting standards | Hedging Relationships |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
AOCI beginning balance |  | 0
Cumulative effects from adoption of new accounting standards | Foreign Currency Translation Adjustments |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
AOCI beginning balance |  | 0
Cumulative effects from adoption of new accounting standards | Other |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
AOCI beginning balance |  | 0
Cumulative effects from adoption of new accounting standards | Accumulated Other Comprehensive Income (Loss) |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
AOCI beginning balance |  | $ (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=121641772&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=121641772&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=121370832&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=121370832&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=121641772&loc=d3e681-108580 + Details
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