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Stock-Based Compensation Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation costs | $ 116 | $ 143 | $ 98
Stock-based compensation costs capitalized | 54 | 60 | 37
Incentive Plans | Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation costs | 73 | 102 | 49
Incentive Plans | Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation costs | 1 | 1 | 1
401(k) Savings Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation costs | 33 | 33 | 42
EDCP & DCPD |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation costs | $ 9 | $ 7 | $ 6

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