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Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 05, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 31, 2020 | Jun. 30, 2019 | Apr. 04, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |
Common stock, capital shares reserved for future issuance |  | 83,000,000 |  |  |  |  |
Stock repurchase program, number of shares authorized to be repurchased |  |  |  |  |  |  | 100,000,000
Shares repurchased under stock repurchase program |  | 11,000,000.0 | 25,900,000 |  |  |  |
Stock repurchase program, remaining number of shares authorized to be repurchased |  | 75,100,000 |  |  |  |  |
Four Quarter Period Beginning Third Quarter 2019 Program |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  | $ 4,300 |
Repurchase Program Through End Of Second Quarter 2020 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 1,000 |  |
Subsequent Event |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Common Stock, Dividends (in USD per share) | $ 1.15 |  |  |  |  |  |
Common stock |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Common Stock, Dividends (in USD per share) |  | $ 4.60 | $ 4.20 | $ 3.40 |  |  |

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