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Schedule I - Condensed Financial Information of Parent (Dividends from Subsidiaries and Affiliates) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates | $ 2,020 | $ 108 | $ 538
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Consolidated Subsidiaries | 1,900 | $ 1,200 | $ 1,000
Parent Company [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates | $ 1,200 |  |

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- Definition This element represents disclosure of the aggregate cash dividends paid to the entity by consolidated subsidiaries. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition The cash inflow associated with the amount received from the sale of a business segment or subsidiary or sale of an entity that is related to it but not strictly controlled during the period (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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