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Shareholders' Equity (Shareholders' Equity Activities) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019 | Jan. 01, 2018 | Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | $ 1,718 |  |  |  | $ 1,197 | $ 1,718 | $ 1,197 | $ 725 |  |  |
Acquisition of noncontrolling interest |  |  |  |  |  |  |  |  |  | 69 | (8) |  |  |
Cumulative effect of change in accounting policy |  |  |  |  |  |  |  |  |  |  |  | $ 50 | $ 144 |
Adjusted balance |  |  |  |  | $ 1,768 |  |  |  |  | 1,768 | 1,341 | 1,768 | 1,341 | $ 725
Acquisition of noncontrolling interest |  |  |  |  |  |  |  |  |  | 69 |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |  | 12 | 10 | 12 |  |  |
Tax benefit decrease related to share-based plans |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Common stock issued upon exercise of stock options |  |  |  |  |  |  |  |  | 5 | 2 |  |  |  |
Dividends declared to shareholders ($0.32/share) |  |  |  |  |  |  |  |  | (46) | (44) | (45) |  |  |
Repurchases of common stock |  |  |  |  |  |  |  |  | (4) | (3) | (53) |  |  |
Issuance of ESPP shares |  |  |  |  |  |  |  |  | 3 | 3 | 3 |  |  |
Investments by noncontrolling interests |  |  |  |  |  |  |  |  | 1 |  | 1 |  |  |
Issuance of convertible debt and call spread overlay |  |  |  |  |  |  |  |  |  | 18 |  |  |  |
Distributions to noncontrolling interests |  |  |  |  |  |  |  |  | (14) | (3) | (4) |  |  |
Other noncontrolling interests activity |  |  |  |  |  |  |  |  |  | 2 | (1) |  |  |
Net income | $ 59 | $ 58 | $ 50 | 42 | 53 | $ 56 | $ 64 | 137 | 209 | 310 | 440 |  |  |
Net other comprehensive income (loss) |  |  |  |  |  |  |  |  | (77) | 12 | 127 |  |  |
Ending Balance | 1,857 |  |  |  | 1,718 |  |  |  | $ 1,857 | $ 1,718 | $ 1,197 |  |  |
Dividends declared per share (usd per share) |  |  |  |  |  |  |  |  | $ 0.32 | $ 0.32 | $ 0.32 |  |  |
ASC 842 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting policy |  |  |  |  |  |  |  |  |  |  |  | 21 |  |
ASC 606 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting policy |  |  |  |  |  |  |  |  |  |  |  | 29 |  |
PIC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 2,190 |  |  |  | 2,091 | $ 2,190 | $ 2,091 | $ 2,088 |  |  |
Acquisition of noncontrolling interest |  |  |  |  |  |  |  |  |  |  | (8) |  |  |
Adjusted balance |  |  |  |  |  |  |  |  |  |  |  | 2,190 | 2,091 |
Acquisition of noncontrolling interest |  |  |  |  |  |  |  |  |  | 69 |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |  | 12 | 10 | 12 |  |  |
Tax benefit decrease related to share-based plans |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Common stock issued upon exercise of stock options |  |  |  |  |  |  |  |  | 5 | 2 |  |  |  |
Issuance of ESPP shares |  |  |  |  |  |  |  |  | (1) | (1) | (1) |  |  |
Issuance of convertible debt and call spread overlay |  |  |  |  |  |  |  |  |  | 18 |  |  |  |
Ending Balance | 2,206 |  |  |  | 2,190 |  |  |  | 2,206 | 2,190 | 2,091 |  |  |
Retained Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 1,235 |  |  |  | 854 | 1,235 | 854 | 467 |  |  |
Cumulative effect of change in accounting policy |  |  |  |  |  |  |  |  |  |  |  |  | 144 |
Adjusted balance |  |  |  |  |  |  |  |  |  |  |  | 1,285 | 998 |
Dividends declared to shareholders ($0.32/share) |  |  |  |  |  |  |  |  | (46) | (44) | (45) |  |  |
Net income |  |  |  |  |  |  |  |  | 202 | 281 | 432 |  |  |
Ending Balance | 1,441 |  |  |  | 1,235 |  |  |  | 1,441 | 1,235 | 854 |  |  |
Retained Earnings | ASC 842 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting policy |  |  |  |  |  |  |  |  |  |  |  | 21 |  |
Retained Earnings | ASC 606 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting policy |  |  |  |  |  |  |  |  |  |  |  | 29 |  |
Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | (817) |  |  |  | (818) | (817) | (818) | (769) |  |  |
Adjusted balance |  |  |  |  |  |  |  |  |  |  |  | (817) | (818) |
Repurchases of common stock |  |  |  |  |  |  |  |  | (4) | (3) | (53) |  |  |
Issuance of ESPP shares |  |  |  |  |  |  |  |  | 4 | 4 | 4 |  |  |
Ending Balance | (817) |  |  |  | (817) |  |  |  | (817) | (817) | (818) |  |  |
AOCL |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | (910) |  |  |  | (922) | (910) | (922) | (1,049) |  |  |
Adjusted balance |  |  |  |  |  |  |  |  |  |  |  | (910) | (922) |
Net other comprehensive income (loss) |  |  |  |  |  |  |  |  | (77) | 12 | 127 |  |  |
Ending Balance | (987) |  |  |  | (910) |  |  |  | (987) | (910) | (922) |  |  |
NCI |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | $ 20 |  |  |  | $ (8) | 20 | (8) | (12) |  |  |
Adjusted balance |  |  |  |  |  |  |  |  |  |  |  | $ 20 | $ (8) |
Investments by noncontrolling interests |  |  |  |  |  |  |  |  | 1 |  | 1 |  |  |
Distributions to noncontrolling interests |  |  |  |  |  |  |  |  | (14) | (3) | (4) |  |  |
Other noncontrolling interests activity |  |  |  |  |  |  |  |  |  | 2 | (1) |  |  |
Net income |  |  |  |  |  |  |  |  | 7 | 29 | 8 |  |  |
Net other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Ending Balance | $ 14 |  |  |  | $ 20 |  |  |  | $ 14 | $ 20 | $ (8) |  |  |

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