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v3.19.3.a.u2

Equity (Changes in Common Stock) (Details) - shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Class A Common Stock [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Common stock, shares outstanding at beginning of period (in shares) | 4,516,518,147 | 4,635,000,000 | 4,742,000,000
Stock compensation plans (in shares) | 21,000,000 | 15,000,000 | 19,000,000
Repurchases and retirements of common stock (in shares) | 0 | (140,000,000) | (131,000,000)
Employee stock purchase plan (in shares) | 6,000,000 | 7,000,000 | 5,000,000
Common stock, shares outstanding at end of period (in shares) | 4,543,590,270 | 4,516,518,147 | 4,635,000,000
Class B Common Stock [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Common stock, shares outstanding at beginning of period (in shares) | 9,444,375 | 9,000,000 | 9,000,000
Stock compensation plans (in shares) | 0 | 0 | 0
Repurchases and retirements of common stock (in shares) | 0 | 0 | 0
Employee stock purchase plan (in shares) | 0 | 0 | 0
Common stock, shares outstanding at end of period (in shares) | 9,444,375 | 9,444,375 | 9,000,000

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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + 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=109259400&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=27012166&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=6877327&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=6877327&loc=d3e13212-122682 + Details
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