Shareowners' Equity and Noncontrolling Interest (Accelerated Stock Repurchase) (Details) - USD ($) shares in Millions, $ in Billions |
3 Months Ended | ||
|---|---|---|---|
Sep. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2015 |
|
| November 11, 2015 ASR [Member] | |||
| Accelerated Share Repurchases [Line Items] | |||
| ASR Aggregate Purchase Price | $ 6 | ||
| Stock Repurchased During Period, Shares | 51.9 | ||
| January 19, 2016 settlement of ASR [Member] | |||
| Accelerated Share Repurchases [Line Items] | |||
| Stock Repurchased During Period, Shares | 2.1 | ||
| September 14 and 15, 2016 final settlement of ASR [Member] | |||
| Accelerated Share Repurchases [Line Items] | |||
| Stock Repurchased During Period, Shares | 8.0 | ||