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Equity (Balance of and Changes in Each Component of AOCI) (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] |  |  |  |
Balance, beginning of year |  | $ 5,359 | $ 3,137 | $ 636
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax |  | (2,039) | 2,859 | 3,358
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | (168) | (36) | (178)
Other Comprehensive Income (Loss), Tax |  | 490 | (601) | (679)
Balance, end of year |  | 3,642 | 5,359 | 3,137
Accumulated Translation Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward] |  |  |  |
Balance, beginning of year |  | (69) | (92) | (169)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax |  | 83 | 14 | 80
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | 0 | 0 | 0
Other Comprehensive Income (Loss), Tax |  | (23) | 9 | (3)
Balance, end of year |  | (9) | (69) | (92)
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward] |  |  |  |
Balance, beginning of year | [1] | 5,500 | 3,299 | 856
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | [1] | (2,144) | 2,854 | 3,306
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | [1] | 175 | 42 | 182
Other Comprehensive Income (Loss), Tax | [1] | 520 | (611) | (681)
Balance, end of year | [1] | 3,701 | 5,500 | 3,299
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward] |  |  |  |
Balance, beginning of year |  | (72) | (70) | (51)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax |  | 22 | (9) | (28)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | (7) | (6) | (4)
Other Comprehensive Income (Loss), Tax |  | (7) | 1 | 5
Balance, end of year |  | (50) | (72) | (70)
Accounting Standards Update 2018-02 [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward] |  |  |  |
Stockholders' Equity, Other |  | $ 0 | $ (12) | $ 0
[1] | Includes cash flow hedges of $(22), $(49) and $(26) as of December 31, 2021, 2020 and 2019, respectively. See Note 5 for additional information on cash flow hedges.

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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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