Stockholders' Equity - Dividends Declared (Details) - USD ($) $ / shares in Units, $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Dividends Payable [Line Items] | |||
| Annual dividends declared | $ 1,641 | $ 1,408 | $ 1,120 |
| Common Stock | |||
| Dividends Payable [Line Items] | |||
| Cash dividends declared on Class A and Class B common stock, per share | $ 1.64 | $ 1.39 | $ 1.08 |
| Retained Earnings | |||
| Dividends Payable [Line Items] | |||
| Annual dividends declared | $ 1,641 | $ 1,408 | $ 1,120 |