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Income Taxes - Reconciliation of unrecognized tax benefits (UTB) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Federal, State and Foreign Tax |  |  |
Gross UTB Balance, beginning balance | $ 1,113 | $ 1,167 | $ 647
Additions based on tax positions related to the current year | 91 | 74 | 76
Additions for tax positions of prior years | 22 | 106 | 132
Additions related to recent acquisitions | 0 | 0 | 396
Reductions for tax positions of prior years | (60) | (173) | (56)
Settlements | (57) | (8) | (4)
Reductions due to lapse of applicable statute of limitations | (38) | (53) | (24)
Gross UTB Balance, ending balance | 1,071 | 1,113 | 1,167
Net UTB that would impact the effective tax rate | $ 1,112 | $ 1,145 | $ 1,178

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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