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Equity Method Investments and Variable Interest Entities (Schedule of Equity in Earnings of Unconsolidated Affiliates) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019 | Jan. 01, 2018
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Cumulative effect of change in accounting policy |  |  |  | $ 50 | $ 144
Distributions of earnings of unconsolidated affiliates | $ (69) | $ (75) | $ (62) |  |
Investments | 146 | 344 | 0 |  |
Equity in and advances to unconsolidated affiliates | 850 | 724 |  |  | 452
Accounting Standards Update 2014-09 |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Cumulative effect of change in accounting policy |  |  |  | 29 |
Equity in and advances to unconsolidated affiliates |  |  |  |  | 87
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Equity in and advances to unconsolidated affiliates |  | 8 |  |  | 87
Equity Method Investments |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Beginning balance | 724 | 365 |  |  |
Cumulative effect of change in accounting policy |  |  |  | 29 | 87
Adjusted balance at January 1, |  | 753 | 452 |  |
Equity in earnings of unconsolidated affiliates | 35 | 79 |  |  |
Distributions of earnings of unconsolidated affiliates | (69) | (75) |  |  |
Payments from (advances to) unconsolidated affiliates, net | (10) | (12) |  |  |
Investments | 146 | 344 |  |  |
Foreign currency translation adjustments | (7) | (28) |  |  |
Other | 2 | (36) |  |  |
Ending balance | 850 | 724 | $ 365 |  |
Equity in and advances to unconsolidated affiliates |  | 724 |  | 753 |
Amount allocated to fund ownership venture | $ 141 | $ 344 |  |  |
Equity Method Investments | Accounting Standards Update 2014-09 |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Equity in and advances to unconsolidated affiliates |  |  |  | $ 29 |
Aspire | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |  |
Equity in and advances to unconsolidated affiliates |  |  |  |  | $ 87

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