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Income Taxes, Change in Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Unrecognized Tax Benefits [Roll Forward] |  |  |
Balance as of beginning of year | $ 897 | $ 970 | $ 941
Additions for tax positions related to the current year | 5 | 19 | 23
Additions for tax positions related to prior years | 9 | 30 | 28
Reductions for tax positions related to prior years | (20) | (101) | (19)
Reductions for tax positions related to the lapse of applicable statute of limitations | (44) | (14) | (1)
Settlements | 0 | (7) | (2)
Balance as of end of year | $ 847 | $ 897 | $ 970

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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=120406818&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=84230637&loc=SL6600010-109319 + Details
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