Earnings Per Share (EPS) And Dividends (Dividend Payments On Common Stock) (Detail) - USD ($) $ / shares in Units, $ in Millions |
1 Months Ended | 3 Months Ended | |
|---|---|---|---|
Apr. 30, 2018 |
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| DIVIDENDS PAID PER SHARE OF COMMON STOCK (in dollars per share) | $ 0.45 | $ 0.43 | |
| Dividend Payments on Common Stock | $ 227 | $ 218 | |
| Subsequent Event [Member] | |||
| Common Stock, Dividends, Per Share, Declared | $ 0.45 | ||