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Equity - Shareholders' Equity (Details) - shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Movement in Common Stock and Treasury Stock [Roll Forward] |  |  |
Balance January 1 (in shares) | 3,577,103,522 |  |
Balance December 31 (in shares) | 3,577,103,522 | 3,577,103,522 |
Common Stock |  |  |
Movement in Common Stock and Treasury Stock [Roll Forward] |  |  |
Balance January 1 (in shares) | 3,577,000,000 | 3,577,000,000 | 3,577,000,000
Purchases of treasury stock (in shares) | 0 | 0 | 0
Issuances (in shares) | 0 | 0 | 0
Balance December 31 (in shares) | 3,577,000,000 | 3,577,000,000 | 3,577,000,000
Treasury Stock |  |  |
Movement in Common Stock and Treasury Stock [Roll Forward] |  |  |
Balance January 1 (in shares) | 1,047,000,000 | 1,038,000,000 | 985,000,000
Purchases of treasury stock (in shares) | 11,000,000 | 16,000,000 | 66,000,000
Issuances (in shares) | (9,000,000) | (7,000,000) | (13,000,000)
Balance December 31 (in shares) | 1,049,000,000 | 1,047,000,000 | 1,038,000,000

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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