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Shareholders' Equity (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | $ 2,394 | $ 2,971 | $ 2,293 | $ 2,731 |  |
Net income | 223 | 251 | 448 | 674 |  |
Other comprehensive loss | (108) | (10) | (126) | (12) |  |
Share-based compensation | 15 | 17 | 34 | 36 |  |
Shares issued under stock plans | 22 | 12 | 17 | 2 |  |
Purchases of treasury stock | 0 | (391) | (120) | (789) |  |
Balance at end of period | $ 2,546 | $ 2,850 | $ 2,546 | $ 2,850 |  |
Common Shares |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance at beginning of period (in shares) | 791 | 791 | 791 | 791 |  |
Balance at beginning of period | $ 8 | $ 8 | $ 8 | $ 8 |  |
Balance at end of period (in shares) | 791 | 791 | 791 | 791 |  |
Balance at end of period | $ 8 | $ 8 | $ 8 | $ 8 |  |
Treasury Stock |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance at beginning of period (in shares) | 399 | 380 | 399 | 376 |  |
Balance at beginning of period | $ (10,423) | $ (8,857) | $ (10,340) | $ (8,494) |  |
Shares issued under stock plans (in shares) | 0 | 0 | (2) | (2) |  |
Shares issued under stock plans | $ 15 | $ 11 | $ 52 | $ 46 |  |
Purchases of treasury stock (in shares) | 0 | 5 | 2 | 11 |  |
Purchases of treasury stock | $ 0 | $ (391) | $ (120) | $ (789) |  |
Balance at end of period (in shares) | 399 | 385 | 399 | 385 |  |
Balance at end of period | $ (10,408) | $ (9,237) | $ (10,408) | $ (9,237) |  |
Additional Paid-In Capital |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | 1,034 | 1,005 | 1,057 | 1,031 |  |
Share-based compensation | 15 | 17 | 34 | 36 |  |
Shares issued under stock plans | 7 | 1 | (35) | (44) |  |
Balance at end of period | 1,056 | 1,023 | 1,056 | 1,023 |  |
Accumulated Other Comprehensive Loss |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | (85) | (56) | (67) | (54) |  |
Other comprehensive loss | (108) | (10) | (126) | (12) |  |
Balance at end of period | (193) | (66) | (193) | (66) |  |
Retained Earnings |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | 11,860 | 10,871 | 11,635 | 10,240 |  |
Net income | 223 | 251 | 448 | 674 |  |
Balance at end of period | $ 12,083 | $ 11,122 | $ 12,083 | $ 11,122 |  |
Accounting Standards Update 2014-09 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative-effect adjustment of ASU adoption |  |  |  |  | $ 208 |
Accounting Standards Update 2014-09 | Retained Earnings |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative-effect adjustment of ASU adoption |  |  |  |  | 208 |
Accounting Standards Update 2018-02 | Accumulated Other Comprehensive Loss |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative-effect adjustment of ASU adoption |  |  |  |  | (3) |
Accounting Standards Update 2018-02 | Retained Earnings |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative-effect adjustment of ASU adoption |  |  |  |  | 3 |
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-12 | Accumulated Other Comprehensive Loss |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative-effect adjustment of ASU adoption |  |  |  |  | 3 | $ 3
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-12 | Retained Earnings |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative-effect adjustment of ASU adoption |  |  |  |  | $ (3) |
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2018-02 | Accumulated Other Comprehensive Loss |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative-effect adjustment of ASU adoption |  |  |  |  |  | $ (3)

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