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Stockholders' Equity (Equity Securities Offering) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 20, 2018 | Apr. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |
Maximum value of shares to be issued under ATM program | $ 1,000 |  |  |  |  |  |  |
Proceeds from the issuance of common stock |  |  |  |  |  | $ 13 | $ 21 |
Stock issued during period, shares, DRIP |  |  |  |  |  |  |  | 2.2
Stock issued during period, value, DRIP |  |  |  |  |  |  |  | $ 174
ATM [Member] |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |
Shares, Issued |  |  |  | 2.6 |  |  |  | 2.6
Proceeds from the issuance of common stock |  |  |  | $ 195 |  |  |  |
ATM [Member] | Wells Fargo Bank [Member] |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |
Shares offered |  |  |  |  | 1.3 |  |  |
ATM [Member] | JPMorgan Chase [Member] |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |
Shares offered |  |  | 1.1 |  |  | 1.1 |  |
Forward contract indexed to issuer's equity, forward rate per share |  |  | $ 89.83 |  |  |  |  |
ATM [Member] | Citibank [Member] |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |
Shares offered |  |  |  |  | 1.3 |  |  |
Equity Forwards [Member] |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |
Shares offered |  |  |  |  |  |  | 21.3 |
Settlement alternative, shares |  |  |  |  |  |  | 21.3 |
Shares, Issued |  |  |  | 10.6 | 10.6 |  |  | 10.6
Proceeds from the issuance of common stock |  |  |  | $ 766 | $ 781 |  |  |
Subsequent Event [Member] | ATM [Member] | Citibank [Member] |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |
Shares offered |  | 1.1 |  |  |  |  |  |
Forward contract indexed to issuer's equity, forward rate per share |  | $ 88.82 |  |  |  |  |  |

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